CRAFTWORKS H7 Adjustable Hand Reamer tool Size - 21/32" -23/32"(16.66mm - 18.25mm) Drilling Machine Best Quality Wooden Box packed. Quality item at low prices, All reamers are packed in a fitted wooden Box. Each reamer expands to the smallest size of next larger size Reamers are used for light cut, repair work, removing stock or simply for enlarging holes 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