Female Binding Barrel, Finish Plain, Material Stainless Steel, Barrel Head Style Button, Barrel Drive Type Internal Hex, Thread Size 1/4 In. -20, Barrel Length 1 in, Barrel Diameter 3/8 in, Barrel Thread Depth 3/8 in, Screw Length Not Applicable, Barrel Drive Size 7/32 in, Barrel Head Diameter 21/32 in, Barrel Head Height 3/16 in, Dimensional Standards AMPG 2000 SB. 05, Grip Size 1 in, Made in North America Made in North America, Material Grade/Class 18-8, Material Quality Standards ASTM A582