New Ace Hardware Square 1/2 in. x 2 in. L Socket Adapter S2 Tool, Steel, 
Part Number 2139053. You get a lot of 12 socket adapters that look like the one pictured. 
 
  • 1/2 in. socket drive size
  • 2 in. overall length
  • 1/4 in. hex shank fits all quick-change chucks as well as standard drill chucks
  • Made from premium Chrome Vanadium (CrV) tool steel
  • Heat-treated and tempered steel absorbs shock and resists twisting for superior tool life