4 different diameters to choose from: diameter: 10mm-10.75mm, 10.75mm-11.75mm, 12.75mm-13.75mm, 13.75mm-15.25mm Excellent quality: adjustable manual reamer, made of high speed alloy steel, high hardness for rust protection, durability and long service life nbsp; Main function: suitable for boring molding process and craft processing; cannot be used on the machine, which can damage the blade, only by hand Wide application: Widely used for bore machining, installed in drilling machine, milling machine, etc. nbsp; Package contents: 1 adjustable hand reamer Size: 12.75mm-13.75mm Features: The blades are adjustable and move in the tapered slots in the reamer body. 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 adjust function allows the reamer to maintain a specific size by compensating for wear. Can be readjusted to enlarge and group to the proper size and sharpened. Can only be used by hand, use on a machine could damage the blade. Features: Material: steel alloy. Diameter: 10mm-10.75mm. 10.75 mm-11.75 mm. 12.75 mm-13.75 mm. 13.75 mm-15.25 mm. Content: 1 adjustable manual reamer. Note: - As measurements are taken by hand, sizes shown may vary slightly. Thank you for your understanding. - Depending on the brightness and lighting settings of monitors, the actual color of the item may be slightly different from the photo. Please take the actual product as a reference.