Package included : 3 Pcs Lawn Mower Blade Sharpener + 1 Pcs Lawn Mower Blade BalancerSpecifications:Lawn Mower Blade Material: CorundumBalancers Material: ABSColor: BlueLawn Mower Blade Size: 5*4.7cm/1.9*1.8inchBalancers Size: 6*5cm/2.36*1.97 inchWeight: 432g/0.95lbFeature：1.Made of corundum, strong and durable, quality item which will last long.2.Easy to use, quick sharpening blade. You only need to install it on the electric drill and use it.3.The lawn mower blade sharpener works for power drill and hand drill, handy and greatly effective. It is solid and sturdy enough to sharpen your blade as a new one, effectively improving productivity.4.It can be widely used for sharpening lawn blade, drill blade,lawn tractors, mower, sickle bar cutter, rototillers, and so on.5.The balanced blade is compatible with model 42-100, can quickly test mower cutter balance, according to different diameter cutter, you can choose different diameter steps on the cutter holder for balance test.