Features and Benefits Universal Wrench Extender Adaptor 1/2" drive or 21 mm hex drive Drop forged body with heat treatment Extendable for all kinds of wrenches Designed to extend your wrench with another wrench or power bar giving more leverage on stubborn nuts and bolts The Universal Wrench Extender Adaptor is compatible with 1/2" drive or 21 mm hex drive and features a drop forged body with heat treatment. The adaptor is extendable for all kinds of wrenches and is designed to extend your wrench with another wrench or power bar giving more leverage on stubborn nuts and bolts. For Workshops, Industry, garages, etc. Covered by a 1-year warranty by Tool give the user peace of mind. Since 1984, KTI leads the market by ensuring that its products are rugged, reliable, and reasonably priced for ALL users