Bends 3/16", 1/4", 3/8" and 1/2" O.D. soft copper, aluminum, brass, thin wall steel tubing. Makes smooth, tight-radius 180° bends. Calibrated markings - for making accurate left-hand, right-hand and offset bends. Adjustable hook. Optimum bending radius – for each tubing size. Cushion grips – for extreme comfort. Made of lightweight die-cast aluminum.