A good ground connection is just as important in a welding circuit as the holder and the cables. A good ground clamp reduces energy costs, extends cable life, helps produce consistent welds and allows ground location to be easily changed
Lenco 02030 Ground Clamp, Cable Capacity: 3/0 - 4/0 AWG, Amperage Capacity: 500 amp, Jaw Opening: 1-1/2 Inch, High Copper Alloy, Connection: Cable: Mechanical Oval-Point Screw