10 Pieces M3 to M12 Zinc-plated Stainless Steel Thread Inserts Metal Thread Repair Inserts Self Tapping Slotted Threadsillustrate:They are a new type of fastener that increases the strength of the thread.Self-tapping inserts are embedded in softer materials such as plastics, aluminum alloys, cast iron and copper to create stronger internal threads.Used in the automotive industry, rail car industry, shipbuilding industry, home appliances, construction machinery, office machinery, electronic products, engineering, plastics, high-end furniture and other industries.Name: Golden self-tapping screw sleeveColor: GoldSize: M10x1.5mm M3x0.5mm M4x0.7mm M5x0.8mm M6x1mm M8x1.25mm M8x1.25mmQuantity: 10 pcs/packPackage includes: according to your choice