Features:* Features good heat dissipation performance, a perfect water cooling jacket for motors.* Made of high grade metal material, which is solid, wear-resistant, durable and .* Fine in workmanship and easy to install. Specification:* Item Name: Water Cooling Jacket* Material: Metal* Coil Outer Diameter: Approx. 49mm* Coil Inner Diameter: Approx. 40mm* Height: 24mm* Connector Size: 4mm x 3mm (O.D*I.D) Package list:* 1 x Water Cooling Jacket.