Simpson Strong-Tie #12 x 1-1/4" Self-Drilling Strong-Drive XM Metal Screw, Medium Hex-Washer Head - Quik Guard Coating, Qty. 2,000Load testing and code listing of Strong Drive metal screws ensures reliable performance and maximum load values. Comparative testing proves that XM Medium Head Metal screws from Strong Drive are superior to various fastener types in 33 ksi and 50 ksi steel decking. Key Features 5 16" hex drive (replacement driver bit: BITHEXR516 R1) 1 2" diameter hex washer head is ideal for narrow channel steel decking Available only in 1 1 4" length with #5 drill