Fasten heavy timber beams and load-bearing structures with complete confidence using these Spax screws. Featuring a 65 mm partial thread, this 160 mm screw pulls the upper wooden component tightly against the base without leaving gaps. The t-star plus T30 drive prevents driver bit slippage, delivering direct and secure torque transmission from your power tool. Thanks to the countersunk multi head with milling ribs, the screw sinks cleanly and flush into the timber surface without splitting. The durable Wirox coating delivers superior corrosion protection for your interior projects and covered outdoor installations.