Size : This sharpener is 2.1 x 1.9 inch , please refer to the product picture for details. Quality : Made of corundum, not easy to break, also strong and durable for long time usages. Advantages : It can sharpen the blade easily and quickly, less time and less wait.It can save your time and your energy. Operate easily: This sharpener could be used for power drill and hand drill, it can simply attach to power drills and sharp your lawn mower blade nicely, it is practical tools for daily life. Attention: The lawn mower blade sharpener works for power drill and hand drill, handy and greatly effective; Always replace your blade with an exact replacement blade., Manufacturer: VOANZO