Self-drilling point to aid fixing plasterboard to wall/ceiling track systems with a max. of 2.5mm thickness. NOTE: Partially threaded. Phillips No.2 recess for a positive drive Bugle head to reduce likelihood of damaging the board surface No.2 drill point gives excellent drilling performance into thicker gauge steel (2.5mm). Fire Classification: A1" Thread Dia. mm: 3.9 Length mm: 65 Thread Length mm: 50 Head Type: Bugle Recess Type: Phillips Point Type: Self-Drilling Driver Bit Size: PH2 Finish: Zinc Material: Carbon Steel Max Drilling Thickness mm: 2.5Size 3.9 x 65 - 500 Pieces Timco Drywall Metal Stud Plasterboard Screws - PH - Bugle - Self Drilling in Silver