Product details:

Tweco Roto-Ground 400 A Rotary Ground Device for 1-4/0 cable size is extremely efficient for grounding weldments while rotating on turning rolls or positioners. 8" Long device with 1 head and 3/4" NC shaft stud is made of copper alloy. Device has 2" shaft shouldering up to a steel nut that is welded to the user's rotating work or fixture. Device without brushes, springs or mercury features simple tension adjusting bolt for high efficiency.