Used to secure plasterboard to timber stud work. The collated strips are specifically designed to be compatible with all leading power tool brands. The collated strips are specifically designed to be compatible with all leading power tool brands Fire Classification: A1" Thread Dia. mm: 3.5 Length mm: 45 Thread Length mm: 40 Head Type: Bugle Recess Type: Phillips Point Type: 25 Sharp Driver Bit Size: PH2 Finish: Black Phosphate Material: Carbon Steel Max Drilling Thickness mm: N/ASize 3.5 x 45 - 1000 Pieces Timco Collated Drywall Timber Stud Plasterboard Screws - PH - Bugle - Coarse in Black