DX, BX and GX refer to Hilti direct fastening tool types.
DX tools are powder actuated tools. They are driven by powder cartridges and are best for applications which require higher energy levels. Use them for jobs like fastening to very tough concrete or steel during decking or flooring jobs, fastening wood frames or installing ceiling hangers.
BX tools are battery powered. They are best for light duty applications with the flexibility of cordless. Use the for jobs like laying down hundreds of metres of drywall track, installing electrical fastenings, bottom plate fixing to very tough concrete, or flooring jobs on steel.
GX tools are powered by gas cans. They are best for light duty applications with a single energy source. As with BX tools, you can use them for applications like laying down hundreds of metres of drywall track, installing electrical fastenings, bottom plate fixing to very tough concrete, or flooring jobs on steel.