Performance Machine P00231586AGCH Rear Caliper Mount Chrome for Rigid & Custom Applications w/11.5" Disc Rotor & 3/4" Axle w/Performance Machine 125x4Description for Performance Machine Chrome Vintage Style Rear Caliper Bracket 0023 1586AG CH For Rigid Custom Frames with 11. 5 in. Rotor, 3 4 in. Axle Get their braking power from Performance Machine's proven 4 piston internals, but have taken their styling cues from our Dual Action Cast caliper The reminiscent, CNC machined fins give the caliper its vintage style while keeping the caliper cool and providing optimal braking power with no flex The