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: 302 type Material: Stainless steel SUS303 N.O.(Optional) Inner Size Outer Size Length(mm) Drilling Diameter(mm) Min. Drilling Depth(mm) Quantity Weight Plastic Aluminum Alloy Cast Iron #1 M2.5*0.45 M4.5*0.5 6 4.0-4.1 4.1-4.2 4.2-4.3 8 20pcs 8g / 0.3oz #2 M3*0.5 M5*1.5 6 4.5-4.6 4.6-4.7 4.7-4.8 8 20pcs 10g / 0.4oz #3 M4*0.7 M6.5*0.75 8 5.8-5.9 6.0-6.1 6.1-6.2 10 20pcs 20g / 0.7oz #4 M5*0.8 M8*1.0 10 7.1-7.2 7.3-7.5 7.5-7.6 13 20pcs 32g / 1.1oz #5 M6*1.0 M9*1.0 12 8.1-8.2 8.3-8.5 8.5-8.6 15 20pcs 46g / 1.6oz #6 M6*1.0 M10*1.5 14 9.0-9.2 9.2-9.3 9.3-9.4 17 20pcs 70g / 2.5oz #7 M8*1.25 M12*1.5 15 10.6-10.8 11-11.2 11.2-11.4 18 20pcs 103g / 3.6oz #8 M10*1.5 M14*1.5 18 12.6-12.8 13.0-13.3 13.2-13.4 22 20pcs 151g / 5.3oz #9 M12*1.75 M16*1.5 22 14.6-14.8 15.0-15.3 15.2-15.4 26 20pcs 227g / 8oz #10 M14*2.0 M18*1.5 24 16.6-16.8 17.0-17.3 17.2-17.5 28 10pcs 150g / 5.3oz #11 M16*2.0 M20*1.5 22 18.6-18.8 19.0-19.3 19.2-19.5 27 10pcs 150g / 5.3oz #12 M2*0.4 M4.5*0.5 6 4.0-4.1 4.1-4.2 4.2-4.3 8 20pcs 10g / 0.4oz Package list: 1 set * Threaded Inserts 1、These self tapping thread inserts can be installed directly and do not need you to tap a thread first. 2、They are used in low strength materials, can avoid thread damage and get a good connection performance, to enhance connection strength and improve connection. 3、Used for parts that requires frequent removing, it can greatly improve service life and wear-resistance of screw thread. 4、It can prevent screw from getting loose, especially used for products requiring high coefficient of insurance. 5、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.