The COMB DRL&CTSK HS 4-1/2X4 KEO from Field Tool Supply is a high-speed steel combination drill and countersink tool designed for precision drilling and countersinking. With a diameter of 4-1/2 inches and a countersink size of 4 inches, this tool is ideal for heavy-duty applications. Its durable high-speed steel construction ensures longevity and resistance to wear, making it suitable for both industrial and commercial settings. The design allows for efficient chip removal, enhancing performance and reducing downtime during operations.