CHASE ACT 1.2 AND 1.0 10MM AXLE The Kit includes the following: Full CNC Alloy Adaptor Mount for a 120mm Disc Brake Roto only - 140mm disc adapter sold separately if needed Mount is for 10mm rear axle set up with chain adjuster and bolt to lock adapter in place Left Side Black Chain Adjuster / Disc Brake mount / anti rotation locking shelter and anchor bolt 120mm Disc Brake Rotor fastening system ISO 6 bolt with air vents 6 Disc bolts and washers included 2 disc spacers 0.5mm thickness each (only needed depending on type of rear disc ready hub used) 2 sets of Brake pivot bolt covers to replace the standard brake mounts for a clean, aero design look. (Black and Polished pair) Requires a rear hub with ISO 6 / DISC READY setup.Sold without hydraulic braking system. May Fit other brands of frames, but designed for Chase frames. CHASE RSP 4.0 10MM AXLE The Kit includes the following: Full CNC Alloy Adaptor for the 120mm Disc Brake Mount only 10mm rear axle set up, pin bolt security 120mm Disc Brake Rotor fastening system ISO 6 screws with air vents Chain tensioner with anti-rotation system 6 Disc screws and washers included 2 disc spacers 0.5mm thickness each 2 sets of Covers Brake pivot bolts to replace the standard brake mounts for a clean, aero design look. (Black and Polished pair) 2 Disc Rotor spacers (only needed depending on type of rear disc ready hub used) Requires a rear hub with ISO 6 / DISC READY setup.Sold without hydraulic braking system. May Fit other brands of frames, but designed for Chase frames.