Size: 50 x 47 mm (DL) suitable for most electric drills, designed with convenient and practical rotary scale prefect sharp edge again and can serve you for a long time Easy to use: you can use hand drills and a hand, sharpen the blade easily and quickly. The blade balancer is designed to fit 99% of all center holes. Efficient Tools: Perfect for sharpening turf blades, drill bit blades, lawn mowers, trench cutters, tillers rotary, hoe, etc. the most efficient edge Package includes: 4 pieces of lawn sharpener in blue + 1 piece of blade balancer. Note: Quite heavy so be careful when using it!