Check the listing for details. Whiteside Classical Flat Bottom Bit, 1/2 in. SH x 13/64 in. R. Condition: New. Listed at 59.50 USD. Whiteside 3770 Classical Flat Bottom Router Bit. This larger grooving bit is ideal for raised panel effects in doors, and for adding a bold accent to furniture or large work pieces. It also makes nice edge profiles with the aid of a router table and fence. The bit can be modified for following templates. Select a bearing with the same ID (internal diameter) as the shank on the bit. The OD (outer diameter) of the bearing should be the same size or larger than the large diameter of the bit. Use Lock Collar LC12 for 1/2" shank bits. Carbide tipped. Two wing. Whiteside Machine Company - Claremont, North Carolina. Specifications SH = Shank Size. R = Radius. LD = Large Diameter. CL = Cutting Length. OAL = Overall Length 1/2" SH x 13/64" R x 1-3/8" LD x 9/16" CL x 2-1/2" OAL Model: 3780