Drill flat-bottom holes with smooth, clean edges. Ideal for flush-fit neck attachment ferrule installation (after all, there's no neck plate to hide ragged holes).
Choose your bit based on your finish.
5/8" bit (#4496) will create a slightly bigger hole than our Neck Attachment Ferrules, to accommodate finish overspray build-up in the drilled holes. Patented "Wave Cutter" flutes generate less heat, for longer life and efficient wood chip discharge.
15mm bit (#4497) cuts a smaller hole for a tighter fit — best for oil finishes or thin, vintage-style finishes where build-up is not a factor.
Both bits are forged steel with 8mm (5/16") shank.