Construction Reamer, Hex Nut Shank With Safety Magnet Shank, Large End Dia. (In.) 11/16, Shank Dia. (In.) 1-1/16, Flute Length (In.) 4-1/2, Overall Length (In.) 6-3/8, left Sprial Right Cutting, HSS M2, Black Oxide Finish, Use Them To Ream, True, Enlarge, Align And Debur Holes In Structural Steel Members Such As I-Beams, Angles, Channels And Plates