Rotary Corp brand aftermarket product. Max Torque Torque Converter TCDNS34-OUT Driven Unit. Symmetrical, 3/4" shaft, 7" diameter. Uses 11/16" wide belt.Max Torque Driven. Includes a 2.7" key. Outboard Mount. FitsYerfdog, Brister Thunder Karts, USA Industries, Bob's Kart Shop (BKS) all are OUTBOARD driven which needed to float on the jackshaft to stay aligned with the driver.