A rapid and effective light duty anchoring system for fixing into concrete, brick, stone, concrete block and wood. This through fixing provides a single solution and replaces traditional fixings such as nylon frame and hammer fixings. TIMco 00090TCON Multi Fix Concrete Screw ZYP 7.5 x 90mm Box of 100 Multi-Fix Concrete Screw Countersunk - Yellow TIMco Multi Fix (Masonry) Screws in... The timco 7.5mm concrete screw are available in boxes of 100, they come in various lengths up to 200mm. The concrete screw have a zinc yellow finish and require a t30 driver bit. A 6mm concrete bit will be required for drilling. The screws have a 30mm hi-lo starting thread for rapid installation. 7.5mm diameter 6mm drill hole t30 driver bit zinc yellow finish box 100