Standard Size: These handwheels are bored to the standard shaft diameter for their size. Handwheel total diameter: 100mm, center bore diameter: 12mm, slot width: 4mm. Material: The milling handwheel is made of quality bakelite with fine workmanship, smooth surface, strong insulation, and durable use. Features a three-spoke design and internal wavy texture for a non-slip grip and improved handling. Easy Installation: The handwheel comes with a rotating handle and includes a threaded hole for easy assembly. Helps reduce hand fatigue during repetitive operations. Wide Application: Ideal for applications requiring general or precise adjustment by turning a mechanism. Commonly used in industrial machine tools such as milling machines, lathes, and grinders.