SUNBURST SR CUTTERS 3/4” 5/BX SR Cutters have a 1/4"-28 mandrel which threads directly into a right angle drill. 3/4" features an internal cavity for fitting directly over standard fasteners and rivets.. SR Cutters' sharp resinbonded blades quickly remove the usually thick coatings of polysulfide and polythioether material applied to the seams of wing panels and fuel tanks without damage to the substrate.