The Air Conditioning Copper Tube Spring Bender Kit includes a mandrel made of steel and alloy steel, with a round shape and a length of 36 inches. The package dimensions are 13.7×13.7×1.75 inches, and the weight is 3.85 pounds. The kit comes with a #4 screw size and a one-way drive style, making it suitable for bending copper tubes with sizes 3/8, 1/2, 5/8, and 3/4 inches. It is a reliable tool for professionals in the fasteners and hardware industry.