Sparks, Md.-based Apex Tool Group, the maker of Craftsman hand tools, Lufkin tape rules and Crescent wrenches, among other products, is being sold to Bain Capital Partners. 

The deal is valued at about $1.6 billion, slightly more than Apex’s $1.5 billion in annual revenue. 

Apex is owned equally by Danaher and Cooper, two manufacturers that combined their tool businesses in July 2010 with the formation of Apex.