General description Used to secure plasterboard to timber stud work, these TIMco collated drywall screws feature a coarse thread and are designed for efficient use with power tools. Technical specifications Size: 4.2 x 75mm Colour/Plating: Black Phosphate Recess Type: Phillips Head Type: Bugle Pack Type: Box Pack Quantity: 500 Threading: Partially threaded Compatibility and accessories Compatible with all leading power tool brands