4" Radius Blocks

  • 21 Reviews
  • Write a review

Radius wood blocks for spot-leveling frets and fingerboards, just add sandpaper. Short length is great for working on compound radii. They make great fret-gluing cauls, too!

Read more

7-1/4" radius

Item # 0410
In stock, ready to ship!



9-1/2" radius

Item # 0404
In stock, ready to ship!



10" radius

Item # 0411
In stock, ready to ship!



11" radius

Item # 0414
In stock, ready to ship!



12" radius

Item # 0412
In stock, ready to ship!



14" radius

Item # 0407
In stock, ready to ship!



15" radius

Item # 0408
In stock, ready to ship!



16" radius

Item # 0413
In stock, ready to ship!



17" radius

Item # 0409
In stock, ready to ship!



20" radius

Item # 0402
In stock, ready to ship!


Total: $0.00
Quantity: 20


Radius wood blocks for spot-leveling frets and fingerboards, just add sandpaper. Short length is great for working on compound radii. They make great fret-gluing cauls, too!

Create an accurate radius quickly and without guesswork.
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.

These 4" blocks are used for spot leveling, and can also be used as a radiused clamping caul when gluing frets. The longer 8" blocks are better for consistent, full-fingerboard radius leveling.

Dimensions: 4" (101.60mm) long x 2-3/4" (69.85mm) wide

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

4" Radius Blocks

  • Based on 21 Reviews
Displaying 1 of 3 1 2 3
Write a review

The right shape!

By seb from Sydney
(Customer's Reviews) Thursday, February 20, 2014

Ahhh...perfectly shaped. A few quick runs over and I was done.


By preetcher from Beaufort, NC
(Customer's Reviews) Saturday, February 08, 2014

Works as advertised. Takes a lot of elbow grease.

Absloutely Perfect

By CDC from Austin, TX
(Customer's Reviews) Saturday, October 19, 2013

Definitely saved time and makes sure the radius is constant. I have several different blocks for several different needs.

Handy tool

By Gustav from Sweden
(Customer's Reviews) Friday, June 14, 2013

Very handy tool. Next time i'll buy the longer aluminum one. I feel there is a need for them both

Serves its' purpose

By Smitty Lange from Erath, LA
(Customer's Reviews) Thursday, April 18, 2013

Does exactly as it's intended to. I have both short and long one and love them both.

Works as expected -

By tb from Portland OR
(Customer's Reviews) Thursday, September 27, 2012

Not the first one I've purchased - Works great and I'm sure I'll purchase more.

radius block

By bluesplayerx from ca
(Customer's Reviews) Thursday, September 13, 2012

works fine , once you get the hang of it

Excellent sanding block!

By Pat K from Cleveland, OH
(Customer's Reviews) Sunday, June 17, 2012

I didn't even shop around for where else I might have gotten a 16" radius sanding block (since StewMac always comes through for me, and FAST). But this was a VERY nice block, consistent. Did exactly what I needed it to do, and the price was pretty good. The project I used this on was an ESP Ltd B-255 that I converted to fretless (defretted, slot-filled w epoxy & rosewood dust, then covered the fingerboard with about 2mm of epoxy). Used this block to sand the epoxy on the fingerboard back to correct 16" radius. Worked Great!

Very good tool

By Quicksilver44 from FL
(Customer's Reviews) Saturday, June 02, 2012

Stewmac is very consistent with their products, this is the second block i bought, i have the 8" long one and i just wanted to get the shorter one to do a spot-radius correction near the heel of my fretless j-bass (approx. positions 15 - 20). Both blocks look just about perfect.

Necessary Tool!

By Big Ed from California
(Customer's Reviews) Thursday, March 08, 2012

This radius sanding block is very necessary in fret leveling! It is high quality and well worth the money for the great job it does! I would never attempt leveling without one!

Displaying 1 of 3
1 2 3

Shown on page 11 of our latest catalog.