Rugged induction motor ensure years of service, and provide plenty of power to avoid stalling; Sealed ball bearings support motor shaft for exceptional long wear; Large adjustable PC eye-shields for users? safety; High quality rocker switch ensure fluent function; Adjustable work rest make proper wheel wear compensation; Well-balanced construction, cast iron motor housing and base ensure steady running; Fully balanced wheels to ensure least wheel run out and tool vibration. SPEC. TDS-125 TDS-150E TDS-150 TDS-150H TDS-200 TDS-200H TDS-250E TDS-250 Motor 1/4HP 1/3HP 1/2HP 1/2HP 1/2HP 3/4HP 1HP 1HP Speed(rpm)2850, 34502850, 3450 2850, 3450 2850, 3450 2850, 3450 2850, 3450 28501750, 2850 Shaft Dia. 1/2" 1/2" 1/2" 1/2" 3/4" 3/4" 5/8" 5/8" Wheel Size 5"x 5/8" 6" x 3/4" 6" x 1" 6" x 1" 8" x 3/4" 8"x 1" 10"x 1" 10"x 1" Work light Standard optional parts on all the models available