Specification Brand : MCMASKE BulletPoint1 : High Quality 8 Kinds Stainless Steel Hex nuts with lock washer/ Keps Nuts/ K-lock Nuts Assortment Kit total 163 piece BulletPoint2 : The Keps nuts kit assortments contain the following sizes:#4-40 UNC --40PCS, #6-32 UNC --30PCS, #8-32 UNC --25PCS, #10-32 UNF(fine thread)--20PCS, #10-24 UNC --20PCS, 1/4"-20 UNC --15PCS,5/16"-18 UNC --10PCS,3/8"-16 UNC --3PCS BulletPoint3 : The hex nut are made of 304 Stainless Steel;they are chemical resistant and may be mildly magnetic;The lock(tooth) washers are made of 420 Stainless Steel,theyare chemical resistant with have magnetic BulletPoint4 : These assortments include nuts with tooth washers that bite into surfaces to resist loosening BulletPoint5 : Set includes most common SAE standard sizes so you can easily replace a lost nut;Packed in a plastic box,Easy to install Color : Transparent DriveSystem : External Hex DriveSystem1 : Slotted DriveSystem2 : Cross ExteriorFinish : Stainless Steel ExteriorFinish1 : Silver ExteriorFinish2 : Nickel ExternallyAssignedProductIdentifier1 : 738634035180 ExternallyAssignedProductIdentifier2 : 0738634035180 FinishType : Polished GradeRating : industrial ItemName : MCMASKE #4-40 to 3/8"-16 Stainless Steel Keps Nuts/K-Lock Nuts Assortment Kit;Hex Nuts with Tooth washers for #4-40#6-32#8-32#10-24#10-32 1/4"-20 5/16"-18 3/8"-16 Screws/Bolts ItemPackageDimensions_Height : 16.2052 centimeters ItemPackageDimensions_Length : 2.2098 centimeters ItemPackageDimensions_Width : 10.795 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : hardware-locknuts Manufacturer : yongtaifeng Material : Stainless Steel Material1 : Nickel Material2 : Zinc MeasurementSystem : Inch MeasurementSystem1 : Metric MeasurementSystem2 : Inch MetalType : Stainless Steel MetalType1 : Alloy Steel MetalType2 : Copper ModelNumber : 2022092108 NumberOfItems : 1 NumberOfPieces : 163 PartNumber : 2022092108 ProductDescription : Hex nuts with lock washer often referred to as keps or K-lock nuts,these nuts have a free-spinning lock washer to resist loosening once fastened nuts with tooth washer have teeth that bite into the surface when tightened