4 x 20mm Countersunk WIROX. Full thread. Qty 1000.

SPAX multi-purpose screws are great for a range of projects from decking, cladding and timber construction. In WIROX they are safe to use INDOORS. Featuring the SPAX 4CUT point which reduces the need for predrilling and reduces the likelihood of splitting your timber. Also ground serrations on the thread make driving a breeze, and easier on your drill and its battery. The SPAX MULTI Head countersinks your screw and stops driving on metal. Combine all this with the T-STAR plus torx drive to prevent cam outs and you’ve got the best multi-purpose WIROX screw on the planet.