The product is easy to use</br>The product is durable</br>The product is manufactured in China</br>Exclusive Quik-Lok accepts all 7/16in shanks</br>Impact Rated?? making this the most versatile extension on the market</br>Quick change of bits?? no tools required</br></br>Product Description</br></br>ALLHEX QK CHG EXT 5-1/2"/16" . The product is easy to use. The product is durable. The product is manufactured in China.</br><br/>http://www.amazon.com/gp/product/B001CX0V6CCt