FEATURES: The Hillman Socket-head Cap Screw carries a recessed internal socket drive to add strength. The socket head cap screw is commonly used on machine parts, manufacturing equipment, and other mechanical applications. The socket head screw will get the job done! Socket-head cap screws feature coarse 1/4 in.-20 size thread; measure 1 in. L Part of the Hillman Deep Drawer program Ideal for use in confined areas where the head needs to be flush or below the surface Socket head cap screw installs easily with an Allen-style wrench Socket head screw has a high torque capability Made of high-strength, corrosion-resistant steel alloy