#4 Point Mandrel, 1⁄8" shank diameter, fits 1⁄16" (1.59mm) arbor hole. #6 Point Mandrel, 1⁄8" shank diameter fits 1⁄8" arbor hole. 25,000 rpm max. Mandrels sold 3 each per pkg. Try-Pak contains 1 of each size. Mfg: Cratex
Brownells