The Shock Drive is a lightweight, shopquality shock pump built from full CNCmachined aluminum construction for maximum quality and durability\n The ergonomic handle provides pumping comfort\n The diaphragm gauge offers excellent accuracy\n The zeroloss chuck design ensures accurate gauge readings, sealing the valve pin before unthreading\n A tough composite matrix case houses gauge and enhances grip. 400psi (27.5 bar) max