For removal of dust from drilled holes, maximising anchor strength of fixings. Improves adhesion of PU foams and sealants. Tube length 280mm. For hole diameters of over 10mm. For removal of dust from drilled holes, maximising anchor strength of fixings. Improves adhesion of PU foams and sealants. Tube length 280mm. For hole diameters of over 10mm.