DUST COLLECTION - REDUCES CLEAN-UP TIME AND PROVIDES CLEANER SAFER AIR FOR USER. REMOVABLE NOSE PIECE - QUICKLY REMOVES FOR FLUSH SURFACING. REPLACEABLE BRUSH RING - LOW COST MAINTENANCE VS. COMPETITION. COMPLETELY TOOL FREE - COMPATIBLE WITH ALL 4"" 4-1/2"" AND 5"" SMALL ANGLE GRINDERS. BOSCH AIRSWEEP VACUUM COMPATIBLE - PLUG AND PLAY WITHOUT USING ADAPTORS. P/P