YAMAHA BANSHEE ROUND-HOUSING STYLE BEARING CARRIER KIT. FOR 40mm DIAMETER ALUMINUM AFTERMARKET AXLES ONLY. 100% CNC MACHINED ALCOA 6061-T6 ALUMINUM. INCLUDES BEARING CARRIER ASSEMBLY WITH GREASE-ABLE BEARINGS, BRAKE PLATE, BRAKE CALIPER SPACERS, BRAKE PLATE BUSHING, SPANNER WRENCH AND INSTRUCTIONS.