Lock Nut Finish Zinc Plated Hex Height 29 mm Hex Type 3-Piece Safety Wheel Hex Width 34 mm Lock Type 3-Piece Safety Wheel Material Steel Material Grade/Class Not Graded Pack Size Small Pack Rockwell Hardness HRC30-34 System of Measurement Metric Thread Direction Right Hand Thread Pitch 2.5 mm Thread Size M20-2.5 Package Quantity 10