http://www.xgfhardware.com/nuts/weld-nuts/ Product description Metric Steel Hex Weld Nuts You can weld these nuts to flat and uneven uncoated steel surfaces for a strong permanent hold. A collar pilot assists alignment and prevents welding spatter from getting into threads. Product detail Nut TypeWeld,Hex Weld Nut ShapeHex Thread TypeMetric Thread SpacingCoarse Thread FitClass 6H Thread DirectionRight Hand GradeClass 4 MaterialSteel FinishPlain StandardDIN929 Product drawing Quality control process Our customs Packing and shipping Weld Nuts website:http://www.xgfhardware.com/nuts/weld-nuts/