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 x adjustable hand reamer. Features: The blades are adjustable and move in the tapered slots into the body of the reamer. To adjust these reamers, the blades are moved into these slots by loosening the nut on one end and tightening the nut on the other. The movement allows the reamer to be set to any desired diameter within the size adjustment range. The adjustment feature allows the reamer to maintain a size specific by compensating for wear. Can be readjusted to expand and group to the appropriate size and sharpened. Can be used by hand only, use on a machine could damage the blade. Sold by MSBD store