Product information, , Double spiral U-shape design for efficient drill dust transport, High stability for dowel drilling, Compatible with cylindrical shank systems for corded or cordless hammer drills, Diameter mm: 4.0 , 5.0 , 5.5 , 6.0 , 7.0 , 8.0 , 10.0, Working length mm: 40.0 , 50.0 , 50.0 , 60.0 , 60.0 , 80.0 , 80.0, Total length mm: 75.0 , 85.0 , 85.0 , 100.0 , 100.0 , 120.0 , 120.0