Jerax tools M2 High Speed Steel Premium Chucking Reamer Set, 14 pcs Over and Under Sizes 0.1240'' Thru 0.5010'', Spiral Flute, Enlarge, Smoothing and Finishing Holes

[M2 HSS Material]: Compared to other commonly used grade HSS. M2 has 50% more Tungsten and 150% more Molybdenum, both of which are key elements in improving the durability. | [Nitriding Surface]: Has high surface hardness, better corrosion resistance and longer fatigue life. | [Spiral Flute]: Spiral groove facilitate the chips removal, saving time, cost and effort during the operation. | [Wide Application]: Designed for accurate enlarging, smoothing or finishing holes in stainless steel, cast iron, aluminum, copper, plastic, wood and other non ferrous metals. | [Main Size]: Cutting diameter: 0.501,0.499,0.4385,0.4365,0.376,0.374,0.3135,0.3115,0.251,0.249,0.1885,0.1865,0.126,0.124. Tolerance: Thru 1/2" diameter +.0002" -.0000". Above 1/2" to 5/8" +.0003" -.0000". Above 5/8" to 1-1/2" +.0001" -.0004.