ScratchShield® is a ribbed feature at the end of the lower thread of a crest fixing fastener. It is capable of removing burrs and smoothening out the sharp edges of the roof sheet created by the fastener’s drill point penetration. At the same time, the hole diameter is marginally enlarged to allow scratch free entry of the fastener without compromise on the sheet holding strength of the upper thread. ScratchShield® prevents damage to the coating on the screw’s shank prolonging the lifespan of the fastener and the building system by up to 40%. In a crest fixing application, the hollow space between the roof sheet and the immediate substrate layer is an area of high humidity. Moisture from the rising air coupled with heat from the sheets puts the fasteners’ service life to test. ScratchShield® is a standard feature in most of our crest fixing fasteners.