5/16-12X2 7/16 A/F .172-.190 Head Hgt Unslotted Ind Hex Washer Self Drilling Full Th Zinc (Pack Qty 600) BC-313207KW

May be used for drilling through wood over 1/2” thick and the metal surface behind it. The wings drill out a clearance hole in wood or other soft materials, then snap off when in contact with the metal surface to be drilledYou may also like 8-18X3/8 Unslotted Indented Hex Washer Self Tapping Screw Type AB Fully Threaded Zinc An (Pack Qty 10,000) BC-0806ABW.