Chrislynn Professional Repair Kits are the next step up in thread repair. These kits contain everything needed to complete your repair job. Most of these kits include a high-speed steel STI plug tap, a threaded installation tool, a tang break off punch, a drill, and a generous quantity of inserts, in lengths equal to one, one and a half, and two times the diameter of the insert. (See details on product page of kit for exact components.) These kits are available in metric sizes from M2 to M20.