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- Compatible with DeWalt WS42VA WS42VB DW456A DW456B; 6.3 x 10 x 14 mm blocks fit motors requiring this size; check brush shape and terminal before purchase. - Restores brush contact with the commutator for consistent power and smoother starts; carbon material seats quickly for stable running. - Includes 4 Pcs for routine maintenance; replace when motor sparks increase or speed fluctuates; simple drop-in swap for same-size blocks. - Suited for home DIY, jobsite cutting and grinding, metal fabrication, and maintenance shops; supports frequent on off cycles typical of angle grinders. - After installation, run the tool with no load for several minutes to bed the brushes; inspect commutator and springs; replace both brushes together for balanced wear.