Attaches to any 10mm square material you are using as a mast. Allows adjustment of down thrust angle or simply run a zero thrust line. Mount motor on center of off center to left with provided firewall options. Through fasteners for mounting to boom included. Press together, hold square and soak joints with thin CA. Motor mount is tougher than a discus champion! Laser cut parts kit indicated by screwdriver point. Assemble with provided hardware and your own thin CA. SKU Number: RRCAGMM