... head nail with cap head namehexagon socket countersunk head screw with threadstandardGB/T70.3materialirondimensionM6*20mm cap hole M3weight0. ... located next to shanghai ,Nanjing and Wuxi. Equipped with sophisiticated processing machines :boring mill ,miller,punch ... meter lathe providing integrated services material ability: cast iron ,ordinary steel ,carbon steel,alloy steel ,Aluminum ...