The attachment comprises support (1) blade holder (2) and allen key (3). In this attachment the tool is guided precisely and ground flat along its whole length to a pre-set fixed depth. This is not the case with the other Tormek jigs where your hand decides where the grinding occurs and the depth of grinding. It is important that the grinding angle is set with great accuracy. If you follow the detailed step by step instructions carefully you will be satisfied with the results.