SUM Series precision 20 deg pressure angle stainless steel miter gears stocked in multiple sizes in modules 1~3 in both 20 and 25 tooth. Gears are made of SUS303 and conform to precision grade JIS B 1704 grade 3 standards. Stocked in sizes ranging from Module 1 to Module 3. Bore sizes range from 6 mm to 20 mm and hub diameters from 16 mm to 65 mm.