The part number N501733 is a genuine original equipment manufacturer (OEM) replacement Drive Motor Assembly (Motor SA)for the following cordless trimmer lines:
Black & Decker ST1823-GB (Specifically Type 4)
Black & Decker ST182320-GB (Specifically Type H4)
Black & Decker ST1823B (Specifically Type 4)
Stanley FatMax SFMCST925B (Type 1 variants)