Specification Brand : uxcell BulletPoint1 : Fits Bolt Size: M8 BulletPoint2 : Brass for corrosion resistance, for outside applications, easy to install. BulletPoint3 : Spring washers are a left-hand helix and allow the thread to be tightened in a right-hand direction only. BulletPoint4 : Apply for electrical connections on household and commercial appliances and industrial products, in order to prevent screw loosening or disperse pressure. BulletPoint5 : The benefit of spring lock washers lies in the trapezoidal shape of the washer. When compressed to loads near the proof strength of the bolt, it will twist and flatten. This reduces the spring rate of the bolted joint which allows it to maintain more force under the same vibration levels. This prevents loosening. ItemName : uxcell 30pcs 8mm Inner Dia Brass Split Lock Spring Washer Gasket Gold Tone ItemPackageDimensions_Height : 0.59 inches ItemPackageDimensions_Length : 3.54 inches ItemPackageDimensions_Width : 2.36 inches ItemPackageQuantity : 30 ItemTypeKeyword : spring-lock-washers Manufacturer : uxcell Material : Brass MetalType : Brass NumberOfItems : 30 NumberOfPieces : 30 PartNumber : a24080500ux0655 ProductDescription : Description:Washers are normally used to distribute loads of threaded bolts, screws and nuts evenly as the fastener is tightened. Intended for the general use under the head of a bolt or nut. Suitable for mounting electronics, machinery,models, model aircraft and other supplies. Specification: Material: Brass Main Color: Gold Tone Inner Dia: 8mm/0.31inch Spring Washer Outer Dia: 12mm/0.47inch Package Content: 30 Pcs x Split Lock Washer