All the features and superior performance of the Classic Multi-Purpose Screw with a corrosion resistant coating to withstand over 1,000 hours salt spray. Designed to be used with black ironmongery. Double countersunk reduces the likelihood of head shear and assists completion of countersinking 40° deep single thread to provide a secure fixing with high pull-out resistance Single slash on 25mm+ to reduce torque and the likelihood of the timber splitting when the screw is inserted close to the edge