Reamers for light cut, repair work, removing stock or simply for enlarging holes. Adjustment is easily done with two screwed collars which raise or lower the cutting blades by moving them along tapered seatings. They are locked in position when the required diameter is reached. Each reamer expands to the smallest size of next larger size. Reamers can be hand operated by use of wrenches. 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. HV : 1/4" - 9/32" (6.35mm to 7.14mm) HW : 9/32" - 5/16" (7.14mm to 7.94mm) HZ : 5/16" - 11/32" (7.94mm to 8.73mm) HY : 11/32" - 3/8" (8.73mm to 9.52mm) H1 : 3/8" - 13/32" (9.52mm to 10.32mm) H2 : 13/32" - 7/16" (10.32mm to 11.11mm) H3 : 7/16" - 15/32" , (11.11mm to 11.91mm)