NOT FOR USE ON A LAWN MOWER - THESE ADAPTERS ARE ONLY FOR USE WITH A BLADE BALANCER.
Blade hole adapter for Gravely 30" walk behind mowers. (blades 022528/022530)
Blade hole adapters are for lawn mower blades that do not have a circular hole, these adapters allow you to mount these blades to a MAG-1000 Series Blade Balancer.