Mulching blade has additional cutting edhe about 3/4" above the leadin
edge to shred the clippings. Machine usually has a closed or smaller
discharge.

Bring the mower with you to make sure the blade clears the mower deck
and try one.

Thanks for telling me the characteristics of a blade for mulching.
Also, I will make sure the box says that it is for mulching before I
buy it.

Jay Chan