Little Beaver Change Over Kit CCO 5# 5 HP 3 by 4 Inch Bore Clutch Fiber Shoes Drum (Earth Drill Mechanical Power Drive Replacement Part) Hammer Drills Plumbing Pipe Routing: Creates exact Plumbing Pipe Routing: Creates exact clearance holes for PVC and copper piping through wooden studs and dense subflooring with minimal surface tear out Precision Ball Bearing Chuck Support: Internal dual ball bearings stabilize the 1 4 inch hex shank to prevent bit wobble and screw head slipping (1) Set of Heavy Duty Composite Fiber Clutch Shoes Featuring a 3 4 inch shaft bore engine clutch paired with heavy duty fiber shoes and a precision machined steel drum