Technical Data:
Product type: Keyhole router bit
Construction: Carbide tipped

Application:
Creating keyhole slots on the back of picture frames, plaques, signs and similar workpieces

Dimensions:
Large diameter=1/2 in
Small diameter=5/16 in
Cutting length=7/16 in
Overall length=2-1/8 in
Shank diameter=1/2 in

Remark:
Plunge the bit and route the groove in the proper direction for a screw or nail head.