CRAFTWORKS New HW Adjustable Hand reamer tool 9/32"-5/16"- 7.1mm to 7.9mm High Speed Steel Drilling Machine Best Quality Wooden Box packed Minimum Capacity : 9/32" (7.1mm) Maximum Capacity : 5/16"(7.9mm) Description: Adjustment is easily done with two screwed collars which raise or lower the cutting blades by moving them along tapered seating. They are locked in position when the required diameter is reached Reamers are used for light cut, repair work, removing stock or simply for enlarging holes. The size can be adjusted by moving the blades in tapered slots by means of loosening one nut and tightening the other Blades are ground. Email us for other sizes for adjustable hand reamers & fix hand reamers.