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" Gauge: 12 Length inch: 2 1/2 Head Type: Double Countersunk Recess Type: Pozi Point Type: 25 Sharp Driver Bit Size: PZ3 Finish: Zinc Material: Carbon SteelSize 12 x 2 1/2 - 200 Pieces Timco Twin-Threaded Woodscrews - PZ - Double Countersunk - Zinc in Silver