Bosch Drill Bit HCD2041 SDS Plus Speed Clean 1 4 x 9 Inch Hollow Concrete Masonry (Hollow Extraction Core 4.25 In Usable Adhesive Anchor Boring) Crown Molding Router Bit 7 cm) Natural Contoured Leather 7 cm) Natural Contoured Leather Country of Origin USA Pro Tip: Apply a light coat of high grade leather conditioner to the handle periodically to preserve its natural sweat wicking properties and keep the contoured grip supple during daily hot weather finishing passes (1) Allen Key OSHA Table 1 Compliant Concrete Drilling: Capturing 90% of airborne respirable crystalline silica dust directly at the point of impact when connected to a HEPA vacuum extractor this tool increases drilling speeds up to 25%