The MILWAUKEE 6 in. Extension for the M18 FUEL 1/4 in. Blind Rivet Tool w/ ONE-KEY (2660) allows users to install rivets in hard-to-reach applications. The all-metal extension has a low profile with a 1.34 in. diameter, equal to the clearance of the standard outer jaw housing on the 2660. This Milwaukee rivet gun extension is compatible with 3/16 in., 7/32 in., 1/4 in. and 9/32 in. nose pieces for the M18 FUEL 1/4 in. Blind Rivet Tool w/ ONE-KEY only (sold separately).