The M3 Boa Replacement Repair Kit in 120 cm fits the Korkers Chrome, Metal head and Darkness boots in size 12-15. This is a complete repair kit designed to fit 1 (left or right) boot in the event a Boa component needs to be replaced. It's an excellent field repair kit and is small enough to keep in a vest or jacket pocket. It includes the knob, reel, tool, lace combo that is designed for repairing or replacing your lacing system on your Korkers boots. Single unit dimensions 5x3x1'', one size. Material: Steel.