Features 1、Suitable for most electric drills, the design has perfect rotation balance, practical and convenient 2、Made of whetstone and steel, strong and durable enough to make your lawn mower get a clean edge and of sharpness again, and can serve you for a long time 3、Both electric drill and hand drill can be used, and the blade can be sharpened easily, quickly and conveniently 4、The blade balancer is designed to fit 99% of all center holes, very practical to use 5、High-efficiency tools are very suitable for grinding lawn blades, drill blades, lawn mowers, sickle bar cutters, wheel tillers, hoes, etc., making the blades more effective Specification Item Type: Lawn Mower Blade Sharpener Material: Whetstone, steel Use: Lawn mower blade grinding Whetstone Diameter: Approx. 51mm / 2in Shank Diameter: Approx. 6.35mm / 1/4in Suitable for most electric drills Package List 4 x Sharpener 1 x Balancer(cover+base)