OSE Quick Change 5" Rail Motor Mount, for TenShock 40mm Motors.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 front plate is screwed to the motor; the bottom screws can optionally be screwed, but we added a keyway to the top half of the front motor plate and a "key" to the bottom half for added strength to the front plate. This is shown in picture 4. In the rear clamp, we added an O-ring to accommodate variations in motor diameter. Since not all 40mm diameter motors are exactly 40.00mm. 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 4 x 3mm, 2 x 4mm Motor hole spacing: 25mm on centerMountting plate thickness: 5mm Motor applications: Tenshock Motors. Requires: m3 & m4 Motor mounting screws x 8mm long. Make sure to use a short enough screw so it doesn't hit the windings. Includes: Front and back mount5mm-diameter mounting screws for mounting to your railsOring for rear clamp pn# mc-9262K203 44mm od x 40mm id x 2mm wideNote: NO Motor included