HeliCoil Master Thread Repair Kit once again contains everything required to do the job right – good number of inserts of standard length (1.5D), HSS drill bit, Finishing tap, installation tool and tang breaking tool – all in a rugged box. These kits are available in metric range from M14 to M20, M24 upto M36 and in UNC/UNF range 9/16” to 1-1/2” .