OSE Quick Change 5" Rail Motor Mount, for 56mm Motor with 4 bolt pattern. Designed to speed up the swamping of a motor during a race or if you are just tired of trying to remove the front screws on your motor for maintenance. The rear motor clamp uses a rubber o-ring to stabilize the motor, which also allows motors with slight variations in the diameter to fit in the same clamp. Once the coupler is loosened, the motor can be removed in less than a minute. Normally, racers would have to remove the front screws, which could take a few minutes, and more importantly, once a motor is removed from a conventional mount, the motor angle has to be realigned. With only 4 screws, the motor is removed while maintaining the motor angle*. Also features clear access to the front motor vents to allow maximum cooling. Specs: Aluminum CNC motor brackets. Width: 5" (approx 127mm) Motor mounting hole: For 4mm screws Motor hole spacing: 30mm on center Motor applications: Works with all 56mm Motors with a 4 Bolt front motor plate, tested to work with Leopard Motors. Requires: m4 Motor mounting screws. The mounting plate is 5mm thick. Normally, a 10mm long screw can be used. Make sure to use a short enough screw so it doesn't hit the windings. Includes: - Mount shown in picture 1- 5mm diameter mounting screws for mounting to your rails- (1) o-ring 3mm wide x 51mm od pn# 9262K751 *This is if you only use 2 of the four front plate screws.