Durable material: made of corundum, high quality, durable, long service life, the blade sharpener can be used repeatedly. Universal size - 55 x 50 mm for each. Small enough to fit in tight spaces and sturdy enough to sharpen your blades. 6.35mm shank for all electric drills. Efficient Sharpening: The mower blade sharpener can simply be attached to an electric drill and sharpen the blade easily and quickly with no gouges or irregularities. Lawn Mower Blade Balancer - 60 x 50 mm. Quickly test the balance of the lawn mower. You can choose different diameter steps on the cutting stand for balance test, according to different cutting diameter. Wide application: used for sharpening lawn blades, lawn tractors, drill blades, lawn mowers, lawn mowers, tillers, bines, etc. (zhongchengdaye)