Is there any way to take off the piece of metal on a lawnmower that connects the blade and the mower?

alright so you take off a blade and you have the little attachment that goes onto the 1" bar that comes out of the mower to attach to the blade. the little attachment secures the blade, its about a 2"x3" peace that looks like there is a gap between the attachment and the bar, is there any way to take that off... just for information, the blade is already off i'm not talking about the piece that holds the blade on but the peace that the blade is placed on before screw goes onto the blade to secure it. there doesn't seem to be any screws or anything to hold it in place. please help and thank you