Oregon auto chainsaw chain grinders are designed for commercial chain sharpening operations. These grinders are made for production saw shops that are sharpening hundreds of chains a week. This machines will grind and advance the chain automatically, so you can focus on other tasks in between changing out chains. This model will sharpen all chains except 3/4" pitch harvester chains. Shown with optional base (sold separately item # ORF 700 STND)