For universal indoor use. Spax-exclusive Wirox surface: 20x more corrosion protection compared to conventional bare zinc plating than required by standard. Overlying semi-circular head with flush tightening surface. Suitable for thin fittings with through hole Optimum power transmission and clean fit even when processing overhead with Spax bit T-Star plus T20 with guide pins. Box contents: 1 Spax box, 500 pieces universal screw, T-Star plus, semicircular head, full thread, 4CUT, WIROX surface, thread diameter (d1) = 4.5 mm x total length s) = 40. Fully threaded length (LgV) = 37 mm, head diameter (Dk): 9 mm, bit not included International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions., Weight: 3.4833037396 Pounds, Manufacturer: SPAX International GmbH & Co. KG