Howe oil cooler tubes replace braided oil line to transfer the oil heat into the surrounding air. The fin design increases the surface area 5 times over straight tubing. Aluminum conducts heat, while braided line is actually an insulator. The outside diameter forms a 1-3/4" diameter allowing the tube to be bent in a standard tubing bender. The inside diameter is sized for 3/4" Pipe thread. May adapt to #10, #12 or #16 oil lines. Sold in five different pre-threaded and chamfered lengths or in bulk up to 9'.