... Teeth 53/16BOSO factory is a professional manufacturer of power tools, and produce spare parts: armatures, stators, aluminium casting, gears ... machine3. Gear is 20CrMnTi4. Gear hardness is 53, as our tools all parts are the same hardness: armature shaft, gear, ... Lee(Mr.) Sales Manager Jiangsu Delika Mechanical and Electric Tools Co.,ltd(BOSO/JIAPENG Power Tools ) Add:Lvsi Port Town,Nantong City,Jiangsu ...