Very clean cuts. The ejector-shank has to be ordered separately! It is not included in the scope of delivery. Hole saw for fast, very clean and circular cuts in mineral wool, PUR foam, polystyrene, leather, rubber, paper, carpet and especially in wood fi ber insulating boards. Fast and easy remove of the saw core by using the PUMPSHANK® ejector. The thin-walled cutting offers to use the core again, e.g. to close the blow-in opening.