The De Walt D25302DH Cordless Dust Extraction System is ddeal for dust free drilling up to 16 mm in diameter with any DEWALT 28V or 36V SDS-Plus hammers. It is powered by an independent motor maintaining maximum hammer performance with no decrease in durability. The high quality washable HEPA filter capable of achieving 99.5% efficiency with dust particles as small as 0.3 microns & it has a quick-fit system for easy tool free assembly & release. It is extremely tough & versatile to meet th