Used to produce a close tolerance surface finish by hand in almost any environment i.e. on site or in a workshop. The HSS straight shank parallel hand reamers are manufactured from hardy high speed steel for effective durability and cutting performance. Feratures and Benefits HSS construction for increased durability and prolonged tool lifespan Produces a close tolerance surface finish Notes Manufactured to BS 328 : Part 4 : 1990 and DIN 206B. Right handed cutting direction Diameter: ~ up to 3.00. Tolerance: +0.008, -0.007. Diameter: Over 3.00 ~ up to 6.00. Tolerance: +0.010, -0.005. Diameter: Over 6.00 ~ up to 10.00. Tolerance: +0.012, -0.006. Diameter: Over 10.00 ~ up to 18.00. Tolerance: +0.015, -0.008. Diameter: Over 18.00 ~ up to 30.00. Tolerance: +0.017, -0.009. Diameter: Over 30.00 ~ up to 50.00. Tolerance: +0.021, -0.012.