It is the replacement for the factory tool rest that comes with many bench grinders. The jig offers much more flexibility in terms of what you can get done than with the standard factory tool rest. The plate is offset for short chisels, such as Japanese or western butt chisels Solid aluminum sharpening jig provides you with a smoothly sliding, side to side action when sharpening. miter slide tool holder design allows the jig to be used as a stone, guiding your blades effectively The sharpening jig can be used with 6in or 8in bench grinders and on many belt , grinders. It quickly and easily mounts directly to the bench in front of the grinder with a track design base and can be readily folded out of the way for grinding if so desired. It can also be completely removed by loosening the large wing knob and sliding the jig from the track base The adjustable replacement tool rest sharpening jig allow you to locate all the basic sharpening positions with your bench grinder (grinder not included) The adjustable sharpening jig is compact in size that can be easily carried around and install for convenient use, Manufacturer: Akfldms