Feature:1. The driving method is pneumatic and the product also plays a good role in heat dissipation.2. The cylinder head is made of cast aluminum, which is very durable and has a long service life.3. G1/2in thread inner diameter is 20mm, G3/8in thread inner diameter is 16.5MM, center hole distance is 58 x 58mm.4. With strict quality control and quality assurance, high safety factor, can be used with peace of mind.5. Great workmanship, this cylinder head can perfect replacement for the old one.Specification:Item Type: Air Compressor Cylinder HeadMaterial: Cast aluminumDrive Mode: PneumaticThread Specifications: G1/2in Thread, Inner Diameter: Approx. 20mm / 0.8inG3/8in Thread, Inner Diameter: Approx. 16.5mm / 0.6inCenter Hole Distance: Approx. 58 x 58mm / 2.3 x 2.3in.Package List:2 x Air Compressor Cylinder Head