The COMB DRL&CTSK HS 4 X 4 KEO from Field Tool Supply is a high-speed steel combination drill and countersink tool designed for precision applications. With a diameter of 4 inches and a countersink size of 4 inches, this tool is perfect for drilling and countersinking in various materials. Its durable high-speed steel construction ensures longevity and resistance to wear, making it suitable for both industrial and commercial use. The design promotes efficient chip removal, enhancing performance and reducing downtime during operations.