Hangzhou Gold-Stone Tradig Co., ltd. (Gold Stone) is involved in designing, producing and trading general machinery parts. Our products include: standard and special sprockets, standard and various special chains, gears ,teethed racks, pulley wheels and belts, taper bushings, couplings, PTO shafts, timing wheels and timing belts, torque limiters, torque arms, worms and turbines, DC /AC and single/three-phase motors, worm reducers, gear reducers, plant reducers. And of course we have the ...