The MILWAUKEE® 6 Extension for the M18 FUEL™ 1/4 Blind Rivet Tool w/ ONE-KEY™ (2660) installs 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 Milwaukee rivet gun extension is compatible with 3/16, 7/32, 1/4 and 9/32 nose pieces for the M18 FUEL™ 1/4 Blind Rivet Tool w/ ONE-KEY™ only (sold separately).