This pack is a combination of the 9 piece metric long Balldriver L-wrench set (10999) and the 13 piece imperial long Balldriver L-wrench set (10937). These keys are made from hardened and durable steel and their finish is solvent and corrosion resistant for long life. Balldriver tips allow for easy insertion and removal of fasteners from a 25 degree angle. The twist to lock cases keeps these keys organised whilst the cases can also be used for additional leverage. These tools have a lifetime guarantee.