Designed and built specifically for a wide variety of bicycle hex work the THH-1 is a set of eight common sizes of professional quality T-Handle hex wrenches built for speed. efficiency. leverage and a perfect fit. Soon to become your favorite hex set. the THH-1 includes a handy tool holder that mounts to any vertical surface. including pegboard and solid surfaces (fasteners not included). 2. 2.5. 3. 4. 5. 6. 8 and 10mm hex wrenches included.