Comparable to that of a motorized grinder for a fraction of the cost 1.Easy to install on the saw bar with the chain in place 2.Replacement parts are available separatelyReplacement Parts Parts NO. 38651 FRAME LOCKING SCREW (5PACK) 38654 PRESSURE THUMB SCREW (5PACK) 39490 HANDLE KIT 39491 ARM KIT 39492 BAR STOP KNOB ADJUSTMENT KIT 39493 SWIVEL SUPPORT 39494 SPRING AND JAW KIT 39495 STOP-SPRING KIT 39496 HEIGHT ADJUSTMENT KNOB KIT 39497 SMALL THUMB SCREW (5PACK) 39498 SWIVEL KIT