Zinc plated steel No. 14 x 1-1/2 in. self drilling hex washer head screws in Invincibox™. Hex size 3/8 in. Package of 50.
Dottie hex washer head self-drilling screws drill a hole and tap threads in one operation. The drilling operation removes metal and can be used in heavier gauge metals. Length is determined from the base of the fastener head.