... ISO9001:2000 &14001 3,good quality 4,reasonable price Steel small Helical GearsFeature:•Material: carbon steel such as C45, 20CrMnTi, 40Cr, 42CrMo ... line of spur gears, ring gears, helical gears, standard gears and non-standard gears. Good quality with reasonable price, timely delivery and great customer service. Steel small Helical Gears