This rotor is for use with the big amp mags. Anything over 7 amps and the rotor tang can overheat and come loose. This brown high-temp rotor has a special "heat sink" ring tang on it to absorb and dissipate the extra heat. The tang is epoxied in place so it can't come off.

This assembly includes the screw-down base and the nylon retention screws on the side to prevent wear between the two plastic parts.

Left-hand (CCW) rotation.