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Amazon has 5-Pc DEWALT Rock Carbide SDS+ Hammer Bit Set for $ 16.00. Shipping is free with Prime or on orders of $ 25+.

Strong core: SDS max bits have tapered core for bit strength and maximum durability, especially when drilling deep holes
Aggressive material removal: Two stage flute design with variable helix pattern of DEWALT SDS hammer drill bits allows for efficient debris removal
Clean, round holes: Two sharp cutting edges for true holes
Wear mark indicator: For accurate diameter of holes
ROCK CARBIDE tip maximizes carbide surface contact for longer bit life.