Bosch Bim (Bi-Metal ) segmented blades are the choice for plunge and cutting off with oscillating multi-tools like the Bosch GOP series.
BIM-TiN flat blade
Plunge cutting in plasterboard or cement-bonded fibre boards (e.g. for installing a ventilator)
Cutting smaller mouldings to length (e.g. aluminium floor cover strips)
Cutting recesses in epoxy/glass fibre reinforced plastic (e.g. dashboard in a boat)
Ois fitting
Long life