DeWalt - DW0521 Keyless Chuck
DeWalt’s keyless chuck adapter for hex chucks on impact drivers accepts round-shanked bits up to 3/8 in. dia.
Compared with a cordless drill, an impact driver has a number of advantages. It is lightweight and compact, generates more torque, and offers more driving control. But its quick-change chuck accepts only hex-shanked drill-bits, which means you can’t use your drawerful of round-shanked bits.
To remedy the problem, DeWalt introduced an all-metal, 3/8-in. keyless chuck adapter (No. DW0521) for impact drivers that accepts round-shanked bits up to 3/8 in. dia. I used it to build a bunch of shop fixtures, and it worked well.