Dormer 8203306 | 23.81mm Diameter x 12.70mm Shank x 1-1/4" Functional Length x 136.53mm OAL 4 Flute Bright Silver Coated HSS G705 Interchangeable-Pilot Counterbore

Interchangeable pilot type counterbore body with 3-flutes, diameter 15/16" with an overall length of 5.3/8" and a flute length of 15/16" and 1/2" reduced straight shank, according to ANSI standard to produce a flat bottom seat for socket-head cap screws with the aid of a detachable pilot with a mounting diameter of 3/16" and a maximum pilot guide diameter of 7/8", HSS with standard bright finish for machining free machining and plain carbon steel, wrought and copper or copper alloys.