Weld Nut Material Steel Finish Black Oxide Thread Size 5/16 In.-18 Base Height 1/8 in Base Width 7/16 in Base Length 1 1/8 in Collar Height 0.078125 in Collar Diameter 0.359375 in System of Measurement Inch Base Shape Hex Barrel or Collar Type Pilot For Hole Diameter 3/8 in Hole Center to Outside Edge 1/4 in Hole Location Offset Pack Size Small Pack Package Quantity 50