Has the following factory of the Mengcun metal head, Hebei metal the head plant http://www.hebftc7.com/ telephone 0317-8210122, mobile phone 13722724665 metal head factory groove qualified basis based on the metal head factory groove qualified advantages: good surface quality, the smooth surface of the groove, pits. Carburizing, oxidation phenomena; geometry, precise groove geometry and shape deviation. Since the surface shape of the head is generally arcuate, and therefore solve the clamping problem a key processing groove.