countersinking

• 100 per cent countersunk flat button head rivets
  百分之百沉头平圆头铆钉
• 120 raised countersunk head bolts with cross recess
  十字槽120半沉头螺栓
• Countersunk flat head screws - penetration depth of cross recesses
  沉头螺钉.十字槽深度
• Hexagon socket flat countersunk head cap screws metric series
  米制系列六角扁平沉头螺钉
• Slotted countersunk head screws with full dog point
  带全蜗杆槽头沉头螺钉
• Countersinks , 90 degrees , with parallel shanks and solid pilots
  直柄实心导杆90沉头钻
• Countersunk slotted raised head screws common head style - product grade
  开槽半沉头螺钉
• Parallel shanks countersinks for angtles 60 90 and 120 inclusive
  60 90 120直柄锥面锪钻
• Slotted countersunk head wood screws . symbol fs
  有槽沉头木螺钉.符号fs
• Countersunk slotted raised head screws common head style
  开槽半沉头螺钉