Feature: 1. Adopts sophisticated production technology, which is compact, sturdy, has high torsion, and has 28:1 gear reduction ratio. 2. With self locking, can realize reverse self locking, so that the motor does not need to continue to apply torsion to maintain the load. 3. Can cope with heavy torsion loads without worrying about rounding or slipping of shafts and holes, providing powerful and stable power for the robot. 4. One side of the gear is a circular slot, and the other side is flat, which is convenient to install and fix the worm gear. 5. Can stably transmit the torsion generated by the gear motor to the output shaft, and increase the use range of the worm gear. Specification: Item Type: Worm Speed Reducer Material: Brass, Stainless Steel Model: For 5204 0001 0002 Gear Shaft: 6mm Hex Hole Worm Wheel: 28 Teeth Use: Motor Internal Drive Accessories And there are clamping bolts on each side. The balanced double bolts setting will produce a balanced and firm clamping force on the shaft. To ensure that the rotating components fixed on the shaft will not move, slip or loosen. The 24mm center distance between the worm and the mating worm gear makes the 3120 series U shape beam an ideal structure for accommodating the gear set.. Package List: 1 x Worm Wheel 1 x Gear Shaft