•Drive Clutch Bore: 1" •Belt: Symmetrical type •Engagement Range: 1600 - 3300 RPM •Recommended Engine: 8HP - 18HP engine, 1"shaft with 1/4" flat key way This unit replaces: Comet 40 Series Torq-A-Verter models 203015A, 203015. It is also is a replacement for Kenbar 400-001, Brister, Cartco, Yerf Dog, Manco, Carter Brothers, Cushman Scooters, and more