Benefits of Self Drilling Screws

A Self-drilling screw is, essentially a self-tapping screw with the added feature of a drill point end. Self-drilling screws eliminate the need for a pre-drilled pilot hole as they perform the drilling, tapping, and fastening in one action. Hardened steel fixings are generally used when fixing metal to metal or metal to timber.

The knurls on the shank help clear off excess swarf (i.e. metal shavings) which prevents the EPDM washers from being damaged, impending the water tightness of the fixing.