The JACK Sharpener sharpens left and right teeth from outer to inner for the best possible result. The large number of settings means it's good for all standard chain types. Grinding head can swivel to left and right. The chain vice can be rotated and moved forward and back. The grinding disc is illuminated. Fix the chain in the vice manually otherwise the equipment and procedure is the similar to the MAXX sharpener. Delivery includes 2 different grinding discs for chain pitches: 1/4“, .325“, 3/8“ and .404“.