Binding Post and Screw Finish Plain Material 18-8 Stainless Steel Screw Head Style Truss Screw Drive Style Tamper-Resistant Torx Thread Size 1/2 In.-13 Barrel Head Style Truss Barrel Head Diameter 1 in Barrel Head Height 5/16 in Made in North America Yes Material Quality Standards ASTM A582 Pack Size Small Resistance Properties Acid-Resistant Chemical-Resistant Corrosion-Resistant