Park Tool THH-1 Sliding T-Handle Hex Wrench SetPark Tool THH 1 Sliding T Handle Hex Wrench Set. 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). Carefully