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. 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: Zinc Material: Carbon Steel Max Drilling Thickness mm: 0.6 Size 3.5 x 35 - 1000 Pieces. CE Standard WebBS EN 14566:2008 Corrosion Rating1 - Clean, dry & low humidity environments. Substrates: Thin Sheet Metal, Drywall.