The Milwaukee SHOCKWAVE Conduit Reaming Bit Holder 1/2in, 3/4in & 1in EMT is engineered to deliver the most reams and be the longest reaching accessory reamer in the industry. Its dual purpose design allows users to ream the inside and outside of the pipe, burr-free, and fasten with a single accessory. Made for use with 1/2 in., 3/4 in. and 1in. EMT, the thick, hardened tool steel blade provides up to 5X blade life vs. the competition. The slim profile allows access for common electrical fastening applications.