Chucking Reamer, Round Shank Shank, Decimal Size (In.) 0.4528, Shank Dia. (In.) Slightly Smaller Than The Cutting Diameter, Flute Length (In.) 1-3/4, Overall Length (In.) 7, Number of Flutes 6, Chamfer (Deg.) 45, Right Hand Cutting, HSS, Bright Finish, For Aluminum, Alloyed, Stainless And Tool Steels, Cast Iron And Plastic, Metric Size 11.5 mm