Wafer Head selfdrilling screw generally have two material: carbon steel and 410 stainless steel.
Wafer Head Self-drilling screw with reduced head height. This reduced head height gives it special characteristics:
1:Avoids interference with moving elements.For use in fixings where an even distribution of pressure is required, without the need for assembling additional flat washers, and without the head protruding excessively:
2: Aesthetic finish as screw is rounded and is concealed once instal...