RS PRO Cross Flat Steel Wood Screw Galvanised, Yellow Passivated, 3.5mm Thread

Pozisquare® driving recess allows high driving torque and "stick fit" between driver and screw
Made from hardened steel, zinc plated and yellow passivated with a waxed finish
Ribbed countersunk head
Fatter neck and thicker shank allow for a deeper recess and improved wall plug performance
Drills own pilot hole even in hardwoods, and reduces splitting
Single-start thread for better holding power and stripping resistance
Driver bit supplied with each box of screws