Name: Poly snap-in valve mounting tool BVT12-7 Material: the main boday is made of high quality plastic, wtih iron core. Using: one side remove the valve and other side remove the valve core Length:170mm Packing:10pcs/package,20pcs/package Designe: The head is equipped with ball bearing design, convinentlya and durable, Adwantage: installs tire valve without cratching rims.