Variable speed (8,000 - 24,000 RPM)Electronic speed control maintains constant speed under loadSoft start feature for smooth start-upsRugged aluminum motor housing with small 3-1/4" diameter for easy handlingSub-base accepts industry standard template guides for convenienceDurable flat top design for stability when changing bitsIndustrial cam-lock for fast and easy depth adjustment and removal of motorPowerful 11 AMP motorBits are installed/removed with two identical size wrenchesAll ball bearing construction for long tool lifeLarge calibrated depth control ring for easy depth adjustmentAccepts 1/2" and 1/4" shank bits