Toolmaster adjustable hand reamers are industrial quality and can be set to any size within the range of the reamer and are often used for odd sized holes.
Toolmaster adjustable reamers have High Speed Steel blades for longer life.
Adjustment is carried out by the adjustment of the two nuts that hold the blade. One nut is loosened while tightening the other. This allows the blades to progress along the taper bottomed slots resulting in an increase or decrease in the diameter