The MILWAUKEE M18 FUEL 1/4 in Blind Rivet Tool w/ ONE-KEY Retention Nose Piece 4-Pack prevents inserted rivets from falling out of trivet tool when the tool is held in any orientation. 3/16 in, 7/32 in, 1/4 in and 9/32 in retention nose pieces included. These rivet gun extension nosepieces are laser-etched with the diameter size in English and metric units. Compatible with the 2660 M18 FUEL 1/4 in Blind Rivet Tool w/ ONE-KEY (sold separately).