Timco 225Z Cill Screws are designed for attaching cills to the base of door or window frames. The self-drilling point allows the screw to easily penetrate both reinforced and unreinforced frames. These screws have a bugle head, a Phillips recess, and a self-tapping thread. They are suitable for use with steel substrates and have a zinc finish. Each box contains 500 pieces. The screws are 4.2 x 50mm in size and tested to BS EN ISO 9227:2006.