2-SIDED LONG LIFE 9.5mm ROTARY BLADE76mm LONG X 7mm WIDE ARBORHARDENED HSS STEELREMOVES SPOT WELDS ON SHEET METALPROVIDES BETTER SEPARATION THAN A PANEL CUTTERSPRING LOADED RETRACTING PILOT/PUNCHCUTS AROUND SPOT WELDS, FREEING THE PANEL WITHOUT DAMAGING UNDERNEATHBLADES INTERCHANGE WITH MANY SPOT WELD ARBORS INCLUDING: BLAIR, EASTWOOD AND MORECUTS AROUND THE EDGE OF THE HOLE AND EJECTS SCRAP AS A SLUG.SPRING LOADED PILOT «POPS» THE SLUG OUTVIRTUALLY BURR-FREE HOLES UNLIKE TWIST DRILLS AND HOLE CUTTERS THAT RIP AND TEAR