These forgefix pozidriv machine screws are designed for use with nuts or pre tapped holes they are zinc plated for increased corrosion resistance their pan head with a flat under head surface makes the screws ideal to lay flat on sheet material of all types thus reducing deformation applicationideal for use in many diy ironmongery electrical and plumbing applications zinc coatings prevent oxidation of the protected metal to create a longer lasting finish it does this by forming a barrier and by