Features 1、The whole machine have simple and compact structure, light weight and possess flexible movement 2、The product have durability, corrosion, impact resistance, oxidation resistance, high temperature resistance, abrasion resistance, etc. 3、The cylinder head using die‑casting process with streamlined design, bring beautiful appearance and excellent heat dissipation 4、Made with heat treatment and surface hardening, come with excellent comprehensive mechanical properties 5、Made of good aluminum material, suitable for piston air compressors and air pump pistons Specification 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 Package List 1 x Air Compressor Piston