DIY Supplies : WoodworkingOrigin : Mainland ChinaCertification : NONE1. The locking screw blocks the screw in the threaded hole so that the screw does not loosen if it is jolted.2. Due to the certain elasticity, the load on the thread can be more uniform, the deviation between the pitch and thread hole pitch and the tooth shape can be eliminated, and the vibration can be absorbed, thereby improving the thread joining strength and fatigue resistance.3. Avoid loop lines, false teeth, and get good joint performance, especially for airplanes and other products that require a high insurance factor to improve suture life.4. High strength, high hardness, durable5.Used in a variety of low strength materials to improve the wear resistance of screw connections and prevent thread damage.Material: stainlessy steelDimensions: inner diameter x pitch x length, 2D = 2 x inner diameterSuch as: M8 (8mm screw diameter) * 1.25 (with a pitch of 1.25mm after installation) * 2D (length after installation 8 * 2 = 16mm)Package include: 20PcsNote: The length of the wire screw sleeve after assembly (i.e. the effective screw hole depth) = inside diameter * DSatisfaction GuaranteeOur first priority is to provede you with an easy,pleasant,and anxiety-free shopping experiencewe try our best to give a clear,candid,and complete of our products and their conditionswe are always ready to help if you have questions or encounter a problem ,but if for any reason you arenot satisfied with a product or service please do not hesitate to contact usIt is very impottant to us that you have a positive & 5 star transaction with us.please contact us promptly before you leave us negative feedback.we weill try our best to resolve you problem.If I am not online,please leave your message,we will reply you once we log in.we reply every message except we have not get your message.Refundwe accept refund if product not as decribedIf the goods are damaged.Please provide photos.We can give you a full refund.Or send you a new itemIf the product is lost. Or the wrong number. If we make a mistake. We accept partial refund compensationServicesAfter receiving the payment. We will send the goods within 12 hours"