Double-Ace Racing Products introduces our .21 Sloped "Thru-the-Floor" Motor Mount. Made from high quality light aluminum custom machined to perfection. The Double-Ace Racing Products Motor Mount will give you the long lasting durability and reliability you will need for both sport and competition applications. SLOPE IS 7 DEGREES WIDTH OF MOUNT WITH ENGINE 3 INCHES LENGTH OF MOUNT 3 INCHES THE MOUNT IS DRILLED AND TAPED4-40 FOR MAC .21, AA.21 AND CMB .21 ENGINES KIT COMES WITH: 1 - TWO PIECES SLOPED MOTOR MOUNT 4 – VIBRATION – DAMPING MOUNTS 4 – 8-32 NUTS 4 – WASHERS 4 – 4-40 ALLEN HEAD MOTOR SCREWS 4 – STAINLESS STEEL FLAT SCREWS