The Kupo G203412 (Silver) 40 inch Grip Arm with Big Handle is a 2 1/2 inch grip head mounted on the end of a 40 inch piece of steel tubing 5/8 inch (16mm) in diameter. The surface of the tubing is painstakingly machined to create a rough texture to ensure a non-slip surface. The 2-1/2 inch grip head consists of a pair of rotating aluminum discs attached to a 5/8 inch (16 mm) receiver.The discs have four different sized ""V"" shaped jaws to accept any accessory with a 5/8 inch, 1/2 inch, 3/8 inch or 1/4 inch mounting stud or tubing. The ""V"" shaped jaws have ""teeth"" that grab whatever is mounted between the plates securely. The 2-1/2 inch grip head features an oversized ergonomic ""T"" handle and dedicated roller bearings designed for maximum torque.