Lincoln Electric 500 amp work clamp is easy to use. No bolts or nuts are needed to operate. 

• Easy operation. Just squeeze, slip jaws over the work, and let go

• No bolts or nuts to tighten

• Jaws open full 2-1/2 (63 mm)

• Welding cable lug bolts directly to the work clamp

• Heavy spring tightly clamps jaws to work or table

• Rated 500 amps at 60% duty cycle