Machine Chucking Straight Shank Reamers are multi-fluted, end cutting tools used to enlarge previously formed holes to a precise diameter with a smooth finish. Chucking reamers have round, straight shanks which can be mounted in chucks, collets or similar toolholders and may be used with a variety of standard portable or stationary machines such as drill presses, turret lathes and screw machines. The cutting end is ground with a 45° chamfer angle for easy entry into the hole. Suitable cutting oils or appropriate coolant fluids are recommended for most reaming operations. A huge range of sizes and tooling materials are available to suit the application and material.