Product details:

Sharpen your chain right on the guide bar! This ultra-high speed grinder attaches directly to the saw bar for no-guess angle accurate sharpening of cross cut and ripping chain to factory specs. Constructed of high-impact plastic. Includes 5/32, 3/16, and 7/32 for chain pitches 3/8 low pro , .325, and 3/8 & .404. Stones for 1/2 and or depth gauge are available separately. Note: This grinder requires sharpening stones with threaded shafts. Grinding stones with unthreaded shafts will not fit the collet.