It is a rotary cutting tool, designed with precision to slightly enlarge the size of a previously formed hole with a high degree of accuracy.
They are made from high carbon steel, high speed steel and cemented carbides. We have been manufacturing Machine Reamers, Extra long reamers, Guide reamers, Taper pin reamers etc. from the last two decades using HSS.

Shell Reamer
Reamer
Reamer
Reamer
Reamer