... 42CrMo 2. High precision 3.Small gear We supply: brass gear,small module gear Feathures:1. Material: Alloy Steel, ... Steel, Hardended & Tempered Steel, Cast Iron, Aluminum, Copper, Brass and so on 2. Heat Treatment: Hardening and Tempering, High ... . Surface Treatment: Galvanizing/Zincplating, Dacrotized, Black Anodic Treatment, Spray Printing, Mirror Finish, Burnishing, Sand-blasting and so on according ...