New centrifugal clutch fits 8 to 13 Hp engines and all others with 1" shaft and 1/4 standard key way. Dual pulley for A size 1/2 wide drive belts. Clutch pulley made from 1 piece steel heli arc welded to Clutch bell. shaft is chromed and precision ground for long life and has a needle bearing. Perfect clutch for Log Splitter, Tiller, Go Kart,Stump Grinder, Sawmill, Compressor, Generator, etc. Please know what you are purchasing. Clutches are shipped to you for free. A hard to find accessory at a reasonable cost. Included are 2 pcs. 1/4-28 self locking set screws. Shipped Priority mail 2 day service. I sometimes sell out of this item. If posted here they are in stock otherwise check back in a week or so I will have more available soon. A very good seller. This clutch has had many positive comments from our buyers. Pulleys as 3 1/4 diameter and clutch drum is approximately 4 inch diameter