Produce a clean, flat bottomed hole every time. Woodline's feature a 3/8" diameter hex shank (HS) or 10mm round shank (RS) for a drill press, precision centering tooth, full surface shearing, high rake angle and anti-walk stabilization teeth. Amana Timberline have a 3/8" diameter round shank. Carbide tipped.

CARBIDE FORSTNER BITS
QUESTIONS & ANSWERS
Ask a Question-
Do you have carbide forstner bits in sets?
We do not.
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MM to inches. Need three inch
Largest we make carbide is 2-1/8" we do make 3" steel.
https://www.woodline.com/products/large-multi-tooth-steel-forstner-bits?variant=39514003079358 -
Do you have a 2/38 forstner bit?
Not in carbide, only steel:
https://www.woodline.com/products/large-multi-tooth-steel-forstner-bits?_pos=2&_sid=3d9a0b6a4&_ss=r