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