This is the Wolf Tooth chain breaker and tire plug multi tool. When paired with the bar end storage sleeves, the tool get stored securely in your bar end. Never get stranded on the trail again with these stowable on the go tools. Features: Compatible with all bicycle chains including 12-speed Inserter tool and bacon strips plug holes in tubeless tires Five plug strips included Hardened steel pin for lifetime durability Requires 4mm hex for chain tool driver which can be found on the EnCase Hex Bit Wrench Specifications: Description: Encase chainbreak tire plug tool Weight: 46g