Qualfast: M20 Hex Slotted/Castle Nut (4) Hexagon Slotted And Castle Nut Metric Steel -Grade 4 DIN 935 1 MPN: M20 Hex Slotted/Castle Nut (4) Attributes: Box Quantity: 25 Dimensions P: 2.5 Dimensions m: 22 Dimensions n: 4.5 Dimensions s: 30 Driving Features: Hexagon Grade: 4 Material: Steel Number of Slots: 6 Supplied In: Pack of (25) Surface Treatment: Plain Thread: Metric Thread Direction: Right Thread Size: M20