Item Type: Air Compressor Piston Material: Aluminum Purpose: Piston air compressor, air pump piston Length: Approx. 39mm / 1.5in Diameter: Approx. 42mm / 1.7in Hole Diameter: Approx. 12mm / 0.5in 1The whole machine have simple and compact structure, light weight and possess flexible movement 2The product have durability, corrosion, impact resistance, oxidation resistance, high temperature resistance, abrasion resistance, etc. 3The cylinder head using die?casting process with streamlined design, bring beautiful appearance and excellent heat dissipation 4Made with heat treatment and surface hardening, come with excellent comprehensive mechanical properties 5Made of good aluminum material, suitable for piston air compressors and air pump pistons1 x AirCompressorPiston