This pulley was from a 2hp vertical Bessemer engine. Bolts included with sale. Diameter of pulley – 5-7/8. Overall Diameter of Pulley – 6-11/16. Hole Spacing – 4-3/4 Center to Center. Inside Hole diameter – 2-3/4. Contact Surface with Belt (Width) – 4-1/4. Overall Width – 4-7/8. I have other parts available for this engine so feel free to check out my other listings. If you have any questions please let me know.