4 different diameters for you to choose: 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 handicraft processing; Cannot be used on the machine, which may damage the blade, only by hand. Wide Application: Widely used for boring machining, installed in drilling machine, milling machine, etc. Package Content: 1 x Adjustable Hand Reamer. Features: The blades are adjustable and move within tapered slots in the reamer body. To adjust these reamers, the blades are moved within 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 specific size by compensating for wear. Can be Re-adjusted to enlarge and regroup to the appropriate size and sharpened. Can only be used by hand, use on a machine may damage the blade. Note: The data are all manual measurements, please allow an error of 1-3cm; due to the difference in light and display, there would be some color difference, please refer to the actual object received.