Power Match® Replacement Sprocket Nose Kits Long nose takes most of the abuse and minimizes wear on the bar body. A single nose for .050", .058" and .063" gauges. Attachment rivet included. (Nose radius 1.115"). Standard replacement sprocket nose kits fit RN bars. Guard Mate® replacement sprocket nose kits fit "GN" bars (additional hole accepts the Guard Mate® bar nose tip guard).