Specification Brand : uxcell BulletPoint1 : [THREADED]: Thread Size: 3/8 -16; Thread Pitch: 16 TPI Coarse Thread UNC; Thread Coverage: Full BulletPoint2 : [SIZE] - 0.55" (14mm) width across flat, 0.45" (11.5mm) height. BulletPoint3 : [MATERIAL]: Made of 304 stainless steel, rust-resistant, and durable to use. BulletPoint4 : [FEATURE]: With a nylon insert, these lock nuts greatly reduce loosening under vibrations and torque. BulletPoint5 : [GREAT REPLACEMENT] - Great replacement for industrial and construction fasteners, also can be an important accessory in your daily life. Color : Silver Tone DriveSystem : External Hex ExteriorFinish : Stainless Steel ExternallyAssignedProductIdentifier1 : 0301652587728 ExternallyAssignedProductIdentifier2 : 301652587728 FinishType : Plain Finish GpsrSafetyAttestation : 1 GradeRating : Commercial ItemName : uxcell 3/8-16 UNC Nylon Insert Hex Lock Nuts, 304 Stainless Steel, Plain Finish, 25pcs ItemPackageDimensions_Height : 12 centimeters ItemPackageDimensions_Length : 2.1 centimeters ItemPackageDimensions_Width : 9.1 centimeters ItemPackageQuantity : 20 ItemTypeKeyword : hardware-locknuts Manufacturer : uxcell Material : Stainless Steel MetalType : Stainless Steel ModelNumber : a21111000ux0085 NumberOfItems : 20 NumberOfPieces : 20 PartNumber : a21111000ux0085 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 deform elastically over the threads of the screw, but threads are not cut into the nylon.