Overview Reviews Product Description Cobalt Bright and black finish Straight shank Right hand cut Left hand helix Left hand spiral flute design pushes chips forward out of the hole and allows the reamer to be used in holes that have an interruption These reamers can be run approximately 25% faster than regular HSS reamers with increased tool life due to cobalt substrate Clarkson Osborn Catalog Product Videos Custom Field Diameter 4.5mm Flute length 21mm Overall length 80mm Package quantity/sold as each 1 Product Reviews Write a Review Write a Review × Clarkson-Osborn 4.5mm Cobalt Chucking Reamer RE24545 Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Review Subject * Comments *