Countersunk Square Drive Stainless Steel Self Drilling Screws
Countersunk Head Square Drive Stainless Steel Self Drilling Screws are designed specifically for drilling through thin sheet metal (without pre-drilling). All Countersunk Head Self Drilling Screws are manufactured from 410 grade stainless steel which can be hardened by heat treatment unlike the 300 series grades.
410 grade is hard and cost effective but does not have the added corrosion resistance offered by the Hex Washer face head options of Marutex Stainless Self Drilling Screws and Hardtec Stainless Self Drilling Screws; which perform better in corrosion resistance than 304 and close to 316 as shown in Salt Spray Test results.
Refer to the Anzor Driver Guide here to match the screws with the driver tips.