H.S.S. Aligning Reamer, Spiral Flute, 3/4", 0.75 inch Straight Shank HSS reamer has a specially designed cutting geometry that is designed to allow this aligning reamer to be used in a magnetic drill which has ¾â€?Weldon shank. The unique multi-flute design for a fast smoother cut and better finishing. Item Size Flute Length Overall Length 0521-0916 9/16" 4" 5-1/2" 0521-1116 11/16" 4-1/2" 6-1/2" 0521-0034 3/4" 5" 7" 0521-0316 13/16" 5" 7" 0521-1516 15/16" 5" 7" 0521-0001 1" 5" 7" 0521-1716 1-1/16" 5" 7" 0521-1316 1-3/16" 5" 7" 0521-0114 1-1/4" 5" 7" ÂÂ