Slotted Hex Washer Concrete Screw 1.Size: M6, 8, 10, 12, 16 ... , 8, 10, 12, 16 20Length: 60-300mm Finish:zinc platedSlotted Hex Washer Concrete Screw1.Size: M6, 8, 10, 12, 162.Length ... ,we are able to have a long distance cooperation. Slotted Hex Washer Concrete Screw