Specifically designed as a multi-purpose product, the 25 sharp point, special thread design, lubrication and corrosion resistant plating ensures the screw will consistently perform efficiently in hardwood, chipboard, MDF, plastic and thin sheet metal, whilst offering exceptional holding power. Double countersunk reduces the likelihood of head shear and assists completion of countersinkingPatented lubrication, designed to enhance screw insertion time and provides greater resistance to corrosion40 deep single thread to provide a secure fixing with high pull-out resistanceSurface hardened up to 750 HV to prevent torque shearing under load and a core hardness of up to 450 HV for improved ductilitySingle slash on 25mm+ to reduce torque and the likelihood of the timber splitting when the screw is inserted close to the edgeAll sizes up to and including 75mm are fully threaded and lengths 80mm and above all have 70mm thread length"Thread Dia. mm - 4.5Length mm - 40Thread Length mm - 35Head Type - Double CountersunkRecess Type - PoziPoint Type - 25 Sharp with Single SlashDriver Bit Size - PZ2Finish - Zinc & YellowMaterial - Carbon Steel Timco Classic Multi-Purpose Screws - PZ - Double Countersunk - Yellow (Size 4.5 x 40 - 200 Pieces) Size: 1000mm x 1000mm