HHIP 7 Piece 1/8-1/2 X 1/16-inch High Speed Steel Chucking Reamer Set Straight shank. Straight flutes. Set includes 1/8, 3/16, 1/4, 5/16, 7/16, and 1/2-inch. Chucking reamers are general-purpose cutting tools that are used for lathes or drill presses. Straight flutes and a solid shank allow them to be securely held in the chuck of a machine. Chucking reamers are often used when high accuracy and a smooth finish are required. Used in general purpose though-hole applications. Used for reaming holes without interrupted cuts.