Both corded and cordless lawn mowers have an arbor size of 7/8".
It is recommended that only BLACK+DECKER replacement blades be used on BLACK+DECKER
lawnmowers. The use of aftermarket blades may cause safety or reliability issues, and may void your lawnmower warranty. In order to purchase these replacement blades, please visit your local BLACK+DECKER retailer, visit your nearest Black and Decker service center or call our Mail Order Department at 888-678-7278.

A list of service centers can be found by accessing the Service Center Locator .