Bosch DXS5054 Speed Clean Dust Extraction Drill Bit, Carbide TippedThis drill bits are built using a solid piece of steel with a dust channel that's milled to Bosch specifications to extract dust while drilling, creating 25 percent greater drilling speed. Highlights: Material : Carbide Tipped Overall Length : 27 inch Flute Length : 17 1 2 inch Drill Size : 1 inch Style : SDS max Shank Type : SDS Max Shank One piece design for durability Part of a dust reduction engineered solution Faster drilling provides up to 25%