Park Tool Quick Change Bit Driver Set (QTH-1) solo Twist shift hub gears are

Twist shift hub gears are easy to use

It's a great balance of stiffness and durability with light weight

and it includes an adjustable hem

but are tucked out of harm's way

How’s that for multi-use

Park Tool Quick Change Bit Driver Set (QTH-1) solo Twist shift hub gears areAbout Park Tool Quick Change Bit Driver Set (QTH 1) The QTH 1 is an ergonomic T handled bit driver equipped with eight common bits to fit a wide variety of fasteners and fittings found on bicycles. The magnetic quick change" handle allows for one handed operation and makes changing bits quick and easy. The bit holder can be magnetically attached to any magnetic surface such as a repair stand or tool box, or can be permanently mounted to any wall or