Steel thread inserts can effectively improve screw connection, greatly improving the reliability. Used in all kinds of low strength materials, thread inserts can largely improve the wear resistance performance of screw connection, and avoid thread damage. Features: These self tapping thread inserts can be installed directly and do not need you to tap a thread first. They are used in low strength materials, can avoid thread damage and get a good connection performance, to enhance connection strength and improve connection. Used for parts that requires frequent removing, it can greatly improve service life and wear-resistance of screw thread. It can prevent screw from getting loose, especially used for products requiring high coefficient of insurance. Easy to maintenance, install a thread insert into a damage screw hole, then the screw hole can be used as normal, in order to avoid workpiece loss. Specification: Product Model: 308 type Material: Zinc plated carbon steel N.O.(Optional)Inner SizeOuter SizeLength(mm)Drilling Diameter(mm)Min. Drilling Depth(mm)QuantityWeight Aluminum AlloyCast Iron 1M3*0.5M5*0.664.6-4.74.7-4.8810pcs6g / 0.2oz 2M4*0.7M6.5*0.886.0-6.16.1-6.21010pcs11g / 0.4oz 3M5*0.8M8*1.0107.4-7.57.6-7.71310pcs19g / 0.7oz 4M6*1.0M10*1.25129.3-9.49.5-9.61510pcs38g / 1.3oz 5M8*1.25M12*1.51411.1-11.311.3-11.51810pcs54g / 1.9oz 6M10*1.5M14*1.51813.1-13.313.3-13.52210pcs87g / 3.1oz 7M12*1.75M16*1.752215.0-15.315.3-15.52610pcs114g / 4oz 8M14*2.0M18*2.02417.0-17.217.3-17.52810pcs150g / 5.3oz 9M16*2.0M20*2.02419.0-19.219.3-19.52710pcs172g / 6.1oz Package list: 10 * Threaded Inserts Package List 1These self tapping thread inserts can be installed directly and do not need you to tap a thread first. 2They are used in low strength materials, can avoid thread damage and get a good connection performance, to enhance connection strength and improve connection. 3Used for parts that requires frequent removing, it can greatly improve service life and wear-resistance of screw thread. 4It can prevent screw from getting loose, especially used for products requiring high coefficient of insurance. 5Easy to maintenance, install a thread insert into a damage screw hole, then the screw hole can be used as normal, in order to avoid workpiece loss.