Left hand steel alloy worm wheel Surface :BO SGS audited More than 20 years experience ... ,Name: Left hand steel alloy worm wheel;Left hand worm wheel;Steel alloy worm wheel 2,For the similar worm wheel ,what can we ... do ?(1), Ability for the material of this kind of worm wheel: Grade3.6,4.6,4.8,5.6,6 ... fastener ,especially the cutting/turning parts.; Left hand steel alloy worm wheel