Weld Nut Material Steel Finish Black Oxide Thread Size 5/16 In.-18 Base Height 5/64 in Base Width 5/8 in Base Length 63/64 in Collar Height 0.03125 in Collar Diameter 0.15 in Number of Weld Projections 4 System of Measurement Inch Base Shape Tab For Hole Diameter 3/8 in Hole Location Center Pack Size Small Pack Package Quantity 50