The MILWAUKEE® M18 FUEL™ 1/4" 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", 7/32", 1/4" and 9/32" 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" Blind Rivet Tool w/ ONE-KEY™ (sold separately).