The Collis 4x4mt Medium Extension Socket is a high-quality fastener designed for industrial use. With a hole size of 4 and a shank size of 4, this inside Morse taper socket is compatible with Collis products and features a sleek black color. Made of durable material, this extension socket has a height of 7 inches and a length of 16 inches, making it an essential component for various fastening applications. The model number 60744 ensures easy identification and compatibility with other Collis products.