Designed With A Deep Center Gullet For Maximum Material Removal Without Clip Loading. Ideal Bits To Use With Templates For Setting Butt Hinges. Cuts All Composition Materials, Plywood, Hardwood, And Soft Wood. Use On CNC And Other Automatic Routers As Well As Hand Held And Table Mounted Portable Routers. MORTISING - CARBIDE TIPPED CARBIDE TIPPED - TOP BEARING 1/4" Shank - 2-7/16" O.A. Length - Carded Cut Dia. X Lgth Ins : 1/2 X 5/16