BBI® self-drilling screw, measurement system: imperial, #12-14 thread, 3/4 in OAL, hex washer head, unslotted drive, zinc CR+3. BBI® 669134 Self-Drilling Screw with Bonded Washer, #12-14, 3/4 in OAL, Hex Washer Head, Unslotted Drive, Zinc CR+3