The MILWAUKEE M18 FUEL 1/4 Blind Rivet Tool w/ ONE-KEY Jaw Set uses a 3-jaw design and is made with premium steel alloy material, which increases jaw durability and life while decreasing the money spent on jaw replacements. The jaws can be easily swapped in and out of the rivet tool and install 3/16, 7/32, 1/4 and 9/32 blind rivets. Compatible with the M18 FUEL 1/4 Blind Rivet Tool w/ ONE-KEY 2660 only (sold separately).