... in Germany): Embedded with the supper hard alloy and cooperates roller bearing, wear resistant, safe, high precision and long lifespan. Gears ... HRC60°heat treatment and the transmission precision is high. 2.Roller: Roller adopts the central hollow style, lightweight, small turning inertia and ... d.Adopt the super hard alloy and roller; uneasy to be wore out. e.Roller runs in circle and the stuck can ...