Features: This is a set of thread repair tools, including steel thread inserts, installation tools, drill bit, dedicated tap, breaker tool. Complete tool set, easy to operate, to help you quickly complete the repair work Steel thread inserts can effectively improve screw connection, greatly improving the reliability. Used for parts that requires frequent removing, it can greatly improve service life and wear-resistance of screw thread. Easy to maintenance, install a thread insert into a damage screw hole, then the screw hole can be used as normal Made of premium metal material, strong strength and durable Specification: Material: stainless steel( thread inserts), iron(other tools) Thread insert: 4-40UNC*1.5d Dedicated Tap: ST4-40 Installation tool: ST4-40 Breaker: 4-40UNC Drill bit: 3.0UNC Weight: Approx.80g/2.8oz Package list: 50 x thread insert 1 x Dedicated Tap 1 x Installation tool 1 x Breaker 1 x Drill bit 1、This is a set of thread repair tools, including steel thread inserts, installation tools, drill bit, dedicated tap, breaker tools 2、Complete tool set, easy to operate, to help you quickly complete the repair work 3、Steel thread inserts can effectively improve screw connection, greatly improving the reliability. 4、Used for parts that requires frequent removing, it can greatly improve service life and wear-resistance of screw thread. 5、Easy to maintenance, install a thread insert into a damage screw hole, then the screw hole can be used as normal