Features: This steel shaft sleeve adapts a crankshaft from 5/8 inch to 3/4 inch diameter and includes 3/16 inch keystock. Compatible with motors having different shaft diameters and suitable for modifying pulleys for varying speed or belt requirements. Helps retain existing components while meeting speed and power requirements, reducing the need to replace motors or pulleys. Enables larger wheel bores to fit smaller axles; suitable for use with gas engine crank shafts to increase crank diameter for pulleys, gearboxes, and similar components. Includes one adapter and one keystock; constructed from cold rolled steel, precision CNC machined, tumbled, and built for high durability.Specification: Condition: New Item Name: 5/8 inch to 3/4 inch Crank Shaft Sleeve Adapter Material: Steel Color: Silver Sleeve Inside Diameter: 5/8 inch Sleeve Outside Diameter: 3/4 inch Sleeve Length: approximately 3 inch Sleeve Keyway Slot: 3/16 inch Package Weight: approximately 60g Package List: 1 x 5/8 inch to 3/4 inch Crank Shaft Sleeve Adapter 1 x Keystock