4 different diameters to choose from: diameter: 13.75-15.25mm ;Excellent quality: adjustable hand reamer, made of high speed alloy steel, high hardness for rust protection, durability and long service life. Main function: suitable for reaming of casting process and craft processing; cannot be used on the machine, which may damage the blade, only by hand. Wide application: widely used for boring machining, installed in the drilling machine, the milling machine, etc. Package contents: 1 adjustable hand reamer. Features: Blades are adjustable and move in tapered slots in the reamer body. To adjust These reamers, the blades are moved in these slots by loosening the nut on one end and tightening the nut on the other. The movement allows the reamer to be adjusted to no any desired diameter within the size adjustment range. The adjustment feature allows the reamer to maintain a specific size by compensating for wear. Can be readjusted to expand and group to the appropriate size and sharpen. Can be used by hand only, use on a machine may damage the blade. Note: Data are all measurements manual, please allow 1-3cm error; due to the difference in light and display, there would be some color difference, please refer to the actual object received.