CAMO No. 15 driver bits are engineered specifically for use with the CAMO hidden deck fastening system, model No. 345001 (SKU 239405) or model No. 345015 (SKU 239410) CAMO Marksman Pro Tools. The built-in shoulder sets automatic depth of drive for maximum holding power, and prevents over-driving the screw. The higher shoulder allows for deeper penetration when using grooved deck boards. 2 per pack.