Biologic designed the T-Tool – a special bar end plug and Allen tool that fit right inside the handlebar grip – invisible but always there when you need it. The patented T-Tool features 4 mm, 5 mm, and 6 mm Allen keys built into one handy unit with a long leverage design for the 5 mm and 6 mm tools. Two equal length 130mm grips supplied, Black with Red Line. (Instead of Grey Line)