Simpson Strong-Tie No. 9 X 1-5/8 in. L Square Galvanized Cement Board Screws 1500 pk

The Length of screw 1-5/8 inch with undersized square drive and course high-low threads. Nibs under the head for easier countersinking. Type 17 point and 0.375 inchribbed wafer head coating with Straight collation.