Item #: 06181945Brand: GibraltarModel #: Features and Benefits Hex socket drive types have a hex-shaped recess in the head and are driven with hex keys or hex socket bits. The driving surface is protected from external damage and provides six sides of contact surface for added torque. Stainless steel is a strong, corrosion-resistant alloy with excellent resistance to heat. It is used in high-stress, outdoor and corrosive applications. Product Specifications Type Shoulder Screw System of Measurement Inch Shoulder Diameter (Inch) 1/2 Shoulder Diameter (Decimal Inch) 0.5000 Thread Size 3/8-16 Shoulder Length (Inch) 3/4 Drive Type Hex Socket Material Grade 303 Material Stainless Steel Head Height (Decimal Inch) 0.302 to 0.312 Head Height (Inch) 5/16 Thread Standard UNC Hex Key Size (Inch) 1/4 Head Diameter (Decimal Inch) 0.7290 to 0.7500 Head Diameter (Inch) 3/4 Thread Depth (Inch) 5/8