The kit includes 12 stainless steel inserts plus the matching tap and installation tool to create a durable repaired thread. Heli-Coil Tap, 10-24 UNC STI. The Thread Repair Kit can also be referred to as 10-24 thread repair kit, 10-24 UNC helicoil kit, stainless thread insert kit, thread insert repair kit, and coil thread insert kit.