Thumb Nut Head Shape Round Finish Plain Material Grade/Class 18-8 Material Stainless Steel Thread Size 1/4 In.-20 Overall Height 3/8 in Head Height 5/32 in Head Diameter 9/16 in Base Height 7/32 in Base Diameter 15/32 in Thread Length 3/8 in System of Measurement Inch Thread Direction Right Hand Material Quality Standards ASTM 581/582 Pack Size Small Pack Package Quantity 5