We use these mounts for our Trailmaster 150 XRS conversion kit. They are for mounting the QS138 90h V3 to a flat plate, or can be cut and welded into steel frames. With holes every 10 degrees, this mount allows critical sprocket positioning. One mount will need to be cut after determining the gear reduction position. Hardware is included: 14 Stainless M8-1.25, 18mm long bolts for the motor and the bottom of this mount. .188”thick A36 Mild Steel Made in USA.