Used to secure plasterboard to drywall and ceiling track systems with a max. of 0.6mm thickness. 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: 55 Thread Length mm: 50 Head Type: Bugle Recess Type: Phillips Point Type: 25 Sharp Driver Bit Size: PH2 Finish: Zinc Material: Carbon Steel Max Drilling Thickness mm: 0.6Size 3.5 x 55 - 1000 Pieces Timco Collated Drywall Metal Stud Plasterboard Screws - PH - Bugle - Fine in Silver