Specification Brand : uxcell BulletPoint1 : [SIZE]: Width Measured From Flat to Flat 7mm / 0.28"; Height 5mm / 0.2". BulletPoint2 : [MATERIAL]: Made of 316 stainless steel, corrosion resistance, oxidation resistance, and durability to use. BulletPoint3 : [FEATURE]: With a nylon insert, these lock nuts greatly reduce loosening under vibrations and torque after long-term use, and have a good fastening effect. BulletPoint4 : [ADVANTAGE]: These nuts are great to have around for use in wood and wet environments. They are strong, corrosion resistant and will support all of your projects. BulletPoint5 : [APPLICATION]: Great for replacing broken or missing nuts. Widely used for repairing furniture or household appliances, automobile, industries, workshops, engineering machinery, ship, DIY, handicrafts, etc. Color : Copper and Steel DriveSystem : External Hex DriveSystem1 : Slotted DriveSystem2 : Cross ExteriorFinish : Stainless Steel ExteriorFinish1 : Silver ExteriorFinish2 : Nickel ExternallyAssignedProductIdentifier1 : 888742009518 ExternallyAssignedProductIdentifier2 : 0888742009518 FinishType : Plain Finish GradeRating : industrial ItemName : uxcell M4 x 0.7mm Nylon Insert Hex Lock Nuts, 316 Stainless Steel, Plain Finish, Pack of 50 ItemPackageDimensions_Height : 14.2 centimeters ItemPackageDimensions_Length : 0.6 centimeters ItemPackageDimensions_Width : 9.8 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : hardware-locknuts Manufacturer : uxcell Material : Stainless Steel Material1 : Nickel Material2 : Zinc MeasurementSystem : Metric MeasurementSystem1 : Metric MeasurementSystem2 : Inch MetalType : Stainless Steel MetalType1 : Alloy Steel MetalType2 : Copper ModelNumber : a18111300ux0063 NumberOfItems : 50 NumberOfPieces : 50 PartNumber : a18111300ux0063 ProductDescription : 1.Nylon-insert lock nut, polymer-insert lock nut, or elastic stop nut, is a kind of locknut. 2.It is a nut with a nylon insert that resists turning. 3.The plastic insert is placed at the end of the nut, and its inner diameter (ID) is slightly smaller than the diameter of the screw. 4.The inserts elastically over the threads of the screw, but threads are not cut into the nylon.