Thumb Nut Head Shape Round Finish Plain Material Grade/Class 18-8 Material Stainless Steel Thread Size 5/16 In.-18 Overall Height 13/32 in Head Height 3/16 in Head Diameter 5/8 in Base Height 7/32 in Base Diameter 17/32 in Thread Length 13/32 in System of Measurement Inch Thread Direction Right Hand Material Quality Standards ASTM 581/582 Pack Size Small Pack Package Quantity 5