TEK SCREWS SELF DRILLING COUNTERSUNK TIMBER TO STEEL 5.5X50mm BOX OF 100No need to pre-drill, this fastener has it's own drill bit These Tek screws are suitable for fixing timber to steel, the countersunk head leaves a flush finish . The wings on the drilling tip overbore the timber and then snap off as soon as they start to pass through the steel or metal. This results in a very high grip. The Phillps recess head allows for fast fastening using a Tek Gun or Drill/driver
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