MGC Magnetic Ground Clamp, 250 A, 3 1 2 in dia, Steel Copper ORS NASCO castings and powdered metal parts castings and powdered metal parts with no slipping or stripping Provides maximum torque without requiring heavy input pressure jaw mechanism naturally grips tighter as more torque is applied to the tool Classic trigger release provides maximum locking force Curved jaw puts tremendous pressure on four points of any style nut or bolt head For heavier application Heavy duty pads come with classic rail profiles and a range of clamp openings that will meet most needs Liquid aluminum paste can be shaped brushed or sprayed Dries to solid aluminum overnight and can be drilled