Used to secure plasterboard to timber stud work. Phillips No.2 recess for a positive drive Bugle head to reduce likelihood of damaging the board surface 25 super sharp point for ease of penetration Coarse thread for extreme hold Fire Classification: A1" Thread Dia. mm: 3.5 Length mm: 35 Thread Length mm: 30 Head Type: Bugle Recess Type: Phillips Point Type: 25 Sharp Driver Bit Size: PH2 Finish: Dark Grey Phosphate Material: Carbon Steel Max Drilling Thickness mm: N/ASize 3.5 x 35 - 1000 Pieces Timco Drywall Timber Stud Plasterboard Screws - PH - Bugle - Coarse Thread in Grey