Blade Balancer MAG-1000 / Magna-Matic MAG-1000Pack Size:1Rotary 9788, Oregon 42-047, Stens MAG-1000 Mounts permanently on wall or on 051-210 stand, Precision made tool, hand-crafted in the USA, Adjustable gauge rod checks blade straightness, Ultra-strong magnet (150 lbs. of breakaway force), Permanently assembled, no loose parts, no set-up, always ready to use, Cone centers the blade for accurate balance readings, Blade hole range of 5/16" to 1 1/2" diameter