The specialized air tool co2 mini kit is everything you need to fix a flat on a large mountain tyre housed in a compact package that fits conveniently on the seat post specialized air tool co2 mini kit features fits seat post diameters from 272mm to 316mm silicon body holds 16g cartridge 90 degree head and 2 sided tyre lever plastic front clip holds 2 glueless patches 16g co2 cartidge included