Malco Bit-Tip Screws Hex Washer Head 10-24X3/4 (100 ct.) - BT153X Screw Size: 10-24x3/4. Head Type (HW) Hex Washer Not Slotted. Driver Size: 5/16" Hex Length of screw: 3/4". Bit-Tip screw #3 Point.