Specification Brand : uxcell BulletPoint1 : Thread Size: (Inner Diameter)M6/0.24"; Product Name: 20pcs x Spring Washer BulletPoint2 : Material: Copper; Weight: 10g BulletPoint3 : Package Content: 20pcs x Spring Washer; Main Color: Copper Tone BulletPoint4 : Thickness: 1.45mm BulletPoint5 : Outer Diameter: 9mm/0.35" ExteriorFinish : Copper ExternallyAssignedProductIdentifier1 : 602451349327 ExternallyAssignedProductIdentifier2 : 0602451349327 ExternallyAssignedProductIdentifier3 : 00030699845200 ItemName : uxcell M6 Copper Split Lock Sealing Ring Spring Washer Fastener 20pcs ItemPackageDimensions_Height : 0.59 inches ItemPackageDimensions_Length : 3.54 inches ItemPackageDimensions_Width : 2.36 inches ItemPackageQuantity : 1 ItemTypeKeyword : spring-lock-washers Manufacturer : uxcell Material : Copper MetalType : Copper ModelNumber : a16030800ux1612 NumberOfItems : 1 NumberOfPieces : 20 PartNumber : a16030800ux1612 ProductDescription : A split washer or a spring lock washer is a ring split at one point and bent into a helical shape. This causes the washer to exert a spring force between the fastener s head and the substrate, which maintains the washer hard against the substrate and the bolt thread hard against the nut or substrate thread, creating more friction and resistance to rotation.