Steel made Self Drilling Screw is ideal for fastening in window or door frames purpose. The Screw is manufactured using quality grade steel which ensures optimum durability for a long period. The Screw is available in several sizes such as 3.5 X 13, 3.9 X 13, 4.2 X 13 and 4.8 X 13mm. Steel made Self Drilling Screw is rigid in design and its surface is zinc plated in nature.