Product DescriptionEach drill attachment has a thicker 17mm long-lasting, durable white fused aluminum stone that sharpen blades of any size.The mower blade balancer assures even sharpening of the lawnmower blade to create razor-sharp cuts.Install in seconds and instantly get professional results with easy to understand instructions.High quality stones sharpen blades in under 10 minutes so you will never spend time and effort on sharpening again!SpecificationMaterial of Grinder Stone: White Fused AluminaMaterial of Shank: Steel, Nickel-PlatedMaterial of Balancer: ABS High Strength PlasticGrinder Stone Size: 50 x 47 mmGrinder Stone Thick: 17 mmShank Size: 1/4 in, 6.35 mmBalancer Size: 60 x 55 mmPackage Included4 x Lawn Mower Blade Sharpening Stones1 x Balancer