Brand Centrifugal Clutch 1″ Bore 14 Tooth Heavy Duty. Perfect for Go Kart Mini Bike. (Chain Size: #40/41/420) Specifications: 1″ Shaft Bore, 14 Tooth, 1 3/10″ Drum Thickness. Two Set Screws are included in the bag, please open the bag with caution, it may drop out- Brand Centrifugal Clutch 1″ Bore 14 Tooth HEAVY DUTY 1900-3600 RPM- 1900-3600 RPM Perfect for Go Kart Mini Bike. (Chain Size: #40/41/420)- This HEAVY DUTY clutch is used primarily on Mini Bikes and Go Karts, also it can be used for many other applications- Specifications: HEAVY DUTY 1″ Shaft Bore, 14 Tooth, 1 3/10″ Drum Thickness- Two Set Screws are included in the bag, please open the bag with caution, it may drop out