DeWalt DCN890P2 Disassembly Procedure page 21

SPEED 1: 13,000 RPM Fastening Steel/Wood to low strength Masonry or Block (<4000 PSI) Typically 19-25mm
SPEED 2: 14,000 RPM Fastening Steel/Wood to high strength Masonry or Block (>4000 PSI) Typically 19-29mm
SPEED 3: 15,000 RPM Fastening Structural Steel/Concrete 13-57mm
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ENGINEERING – MOTOR
Speed Control