The DEWALT D25303DH Cordless Dust Extraction System is ideal for dust free drilling up to 16mm in diameter and is powered by an independent motor maintaining maximum hammer performance with no decrease in durability. The extractor continues to operate for two seconds after the hammer trigger is released to ensure any debris in the telescope or hose is completely removed. The high quality washable HEPA filter is capable of achieving 99.5% efficiency with dust particles as small as 0.3 microns. Maximum extraction is maintained at all times regardless of the hammer speed. It has a compact and low weight design that offers excellent comfort and near perfect balance. It also has a quick release for easy tool free assembly. Applications: - Completely cordless solution ensures this system can be used anywhere.- Preventing dust contamination in environments such as houses, offices and hospitals.- Drilling close to dust sensitive equipment.- Minimising job site clean-up.- To protect the operators eyes when drilling overhead. Bare Unit - No Battery or Charger supplied. Specifications: Fits: DCH273, DCH274.Max. Drill Bit Diameter: 16mm.Max. Drill Bit Length: 160mm.Max. Drilling Depth: 125mm.Weight: 1.4kg.