Feature: 1. The gear is most commonly associated with being the 1s gear in a geartrain. 2. Easy to install and use, it is able to mount on a shaft without the need for a hub. 3. Constructed of hardened steel and mount with two set screws for excellent hold on 8mm shafting. 4. High?hardness, durable and sturdy, wear?resistant and long service life. 5. With 8mm hex hole, excellent workmanship, suitable for industrial robots. Specification: Item Type: Gear Material: Cast Steel Product Model: 4303-4008-0036 Product Specifications: 8mm / 0.31in hex hole 0.8 modulus Outer Diameter: Approx. 30.4mm / 1.20in Pitch Diameter: Approx. 28.8mm / 1.13in Package List: 1 x Gear