The PRO BIKE TOOL Hex Tool Set - Handlebar Insert (Red) is a CNC machined aluminum storage insert which is durable and slim. Just ‘press in’ the insert into a handlebar for convenient storage. Compatible with mountain and road or gravel bike (drop) handlebars - please note the insert kit is ONLY compatible with 18mm to 19.5mm size handlebars (internal diameter), which includes 90% of all handlebars in the market. Please measure before purchase to ensure compatibility and to avoid disappointment! Our Tool includes 2, 2.5, 3, 4, 5, 6 and 8mm hex tool bits, SL3.5 flathead screwdriver, Torx 10, 25 and 30 bit and a PH2 Phillips Screwdriver. That's a 12 part multitool with a folding T-handle for assistance while working. Tool bits are held in place with a magnet while you work. The bar end tool means you cannot forget your tools and you will never be caught out without them, they are literally inside your bike! The storage method is tidy, a great use of space and you will never notice anything when you ride!