Dewalt dt81078 holesaw mandrel sds plus fitting 1432 30160mm dewalt dt8107 qz this holesaw mandrel from dewalt can be used with bi metal hole saws the new quick change mandrel is effective for fast tool free changeovers and quick release collar to prevent hole saw lock up the pilot bit is ideal when used for faster drilling dewalt dt8107 qz holesaw mandrel sds plus fitting 14 30mm