8" Radius Blocks

  • 124 Reviews
  • Write a review

Accurately true or change a fingerboard's radius and level frets.
We make these hardwood blocks for use with Stikit Abrasives, to radius a fretboard quickly, accurately and without guesswork.

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7-1/4" radius

Item # 0415
In stock, ready to ship!



9-1/2" radius

Item # 0405
In stock, ready to ship!



10" radius

Item # 0416
In stock, ready to ship!



11" radius

Item # 0406
In stock, ready to ship!



12" radius

Item # 0417
In stock, ready to ship!



14" radius

Item # 0419
In stock, ready to ship!



15" radius

Item # 0420
In stock, ready to ship!



16" radius

Item # 0418
In stock, ready to ship!



17" radius

Item # 0421
In stock, ready to ship!



20" radius

Item # 0403
In stock, ready to ship!


Total: $0.00
Quantity: 20


Accurately true or change a fingerboard's radius and level frets.
We make these hardwood blocks for use with Stikit Abrasives, to radius a fretboard quickly, accurately and without guesswork.

Shaping fingerboards: use 80 through 220-grit
Leveling frets: use 220 through 400-grit

When working on compound radius fretboards, simply change blocks as you progress along the neck.

Dimensions: 8" (203.20mm) long x 2-3/4" (69.85mm) wide

See our shorter blocks for spot leveling, and for use as clamping cauls when gluing frets.

What's your radius?
Quickly find the curvature of a fingerboard or bridge with a set of radius gauges. Use them frequently to check your work as you smooth or shape a fingerboard or frets: a quick visual check keeps you from accidentally altering the shape—a mistake that's easy to make and hard to fix.

Radius Gauges

Product Instructions

Radius Block Basics

An explanation of the different uses of a radiused sanding block.

Ratings & Reviews

8" Radius Blocks

  • Based on 124 Reviews
Displaying 9 of 13 1 2 3 4 5 6 7 8 9 10 11 12 13
Write a review

Sanding blocks

By Kenny Fox from Perth, Australia
(Customer's Reviews) Saturday, October 08, 2011

Simple and robust, should last for many years. I've even used mine to level the frets.

Machining Grooves

By Feral Customs from Seattle, WA
(Customer's Reviews) Sunday, October 02, 2011

The blocks I receive work just fine, but the radius of them aren't perfect. There are definite machining grooves on the radius left over from the shaping process. They're not large, and with human error taken into account during the sanding of a fingerboard they don't affect the final product a noticeable amount, but they're there none the less.

very nice

By sherman stockton from indiana
(Customer's Reviews) Saturday, October 01, 2011

they work great for sanding or clamping

Good idea, not very good quality

By Konstantin from Moscow, Russia
(Customer's Reviews) Wednesday, September 07, 2011

These blocks do the job, but mine are just not even, some has backbow, some has upbow, not very major, but for me it's just not acceptable. Check yours with a straight edge.


By Marlee Guitar Company from Oakesdale, WA
(Customer's Reviews) Tuesday, September 06, 2011

These things are simplicity defined. After years of considering, evaluating and trying a multitude of radiusing methods, we finally decided to Keep It Simple Stupid! A nice low angle jack plane roughs out the radius and these handy blocks armed with gold stikit 80 grit gets the job done in under 10 or 15 minutes. 16 bucks for a piece of wood? Yeah. It's worth it. The accuracy is perfect and it makes what some people turn into a Rube Goldberg project into a fast, simple and accurate process. Thanks StewMac!

8" wooden radius sanding block

By benderb9 from St Petersburg,FL
(Customer's Reviews) Thursday, September 01, 2011

well I'm not as strong in the forearms and shoulders as I was 20 years ago, but this block made short work of radiusing two oak fretboards for me recently (this is SOLID wood too). Works perfect with 1/2 sheet of paper and a little elbow grease. I couldn't be happier with the end result. excellent for cigar bax guitrs too. Great tool at a good price.


By Midnight Lord from Ottawa
(Customer's Reviews) Wednesday, August 24, 2011

Nothing else to say but what I said in the title.

Got Wood?

By Woodshed Guitar Works from Mechanicsburg, Pa
(Customer's Reviews) Wednesday, August 17, 2011

Well made & accurate. I'm consistently impressed with these sanding blocks and continue to expand my collection.

Great but a bit narrow for 5-string bass neck

By Bassic from Quad Cities, IA
(Customer's Reviews) Monday, August 08, 2011

I used this block to level the Super Glue treatment of a fretless 5-string bass neck's fretboard. Had I checked the neck's top-end width before purchasing this block, I would have realized that it wouldn't be wide enough to sand the upper 1/3 of the neck's fretboard, so that's my error. Even so, this block worked great for the lower 2/3 of the 5-string bass neck. I followed Dan Erlewine's "Super Glue Savior" method and the block helped me to achieve a very acceptably smooth and glossy fretboard finish.

Excellent Tool

By Bill from Puyallup from Puyallup WA
(Customer's Reviews) Thursday, August 04, 2011

The radius sanding block works wonders for those round over jobs on fret boards. I purchased the 20" radii block and it did a great job. I was amazed how fast it shaped the fret board. It left a perfect radii and smooth finish. If you tried this w/o the block you would be in a world of hurt and probably have to buy several new fret boards.

Displaying 9 of 13
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Shown on page 11 of our latest catalog.