100% Brand New and High Quality ! 20T bevel gear, the gear column is iron, and the gear teeth are plastic. Every 2 can be matched together to form a 90-degree transmission structure Number of teeth: 20 teeth Aperture: 8mm (with top wire hole on the side) Modulus: 1 modulus Usage: Purchase 2 components to form a 90-degree transmission structure Material: The silver gear column of this gear is iron, but the black gear teeth are plastic Size: Overall height 15mm, silver cylinder diameter 18mm, gear part diameter is about 26.5mm Package Included:1set