... switch and turn switch make machine more reliable.- Automatic control welding time adjustable at 0.1s-9.9s.- Copper bolt ... hammer, Puling rods or triangle steel bits, earth clamp, welding head for spot weld, waggle wire and washer weld, head ... , air sucker, waggle wires, waggle hook.Optional Accessories:Stud welding head, manual double side welding gun, pneumatic double side welding gun. Spot Welder