The Standard BG 121 is designed to be the most affordable Blade Grinder available. All B.G. Grinders feature a totally enclosed Standard Duty Motor which requires an arbor to mount the R.B.G. Grinding Wheel. All B.G. and R.B.G. Grinders have a Specifically Designed Reversing Switch which allows you to grind both right & left hand blades to a fine hollow grind. All B.G. & R.B.G. Grinders have quick guard removal for easy wheel replacement. 1/2 HP Motor.