A traditional twin-thread woodscrew with single lead start for a fast installation. Mainly used in soft timber applications or masonry with a plastic plug. NOTE: Partially threaded. Double countersunk head reduces the likelihood of head shear and assists completion of countersinking.Partially threaded from 1 1/4” and above.Made from C10-18 steel to ensure consistent quality.60° twin-threads with parallel shank for faster insertion and greater pull-out resistance .Surface hardened up to 750 HV to prevent torque shearing under load and a core hardness of up to 450 HV for improved ductility.25° sharp point and single lead for a fast start and improved thread acceptance.