Lawn Mower Blade Balancer: The blade balancer is compatible with model 42-100. According to the different diameter cutter, you can choose steps of different diameters on the cutter holder to perform a balance test. EASY TO USE - It only takes 10 seconds to install. 1/4" shank fits any electric and manual drill. Just install it on your electric drill to use it. Mower blade sharpener for drill can quickly sharpen old and dull blades. Effectively provide your productivity. Save time and effort. HIGH QUALITY - Lawn mower blade sharpener made of high quality materials, sturdy and durable, quality item will last a long time. Wide Application Lawn Mower Blade Sharpener Widely used for sharpening lawn blades, lawn tractors, lawn mowers, lawn mowers, lawn mowers, garden shears, drill blades, bar cutters, etc., Weight: 0.84657508608 pounds, Manufacturer: Rtxbvg