25PC, 3/16" x 7" with 1/4" SDS Plus Hex Rotary Drill Bits for Concrete Screw USD 52.67. 25PC, 1/4" x 7" with 1/4" SDS Plus Hex Rotary Drill Bits for Concrete Screw USD 52.67. These SDS bits have a special 1/4" HEX Shoulder for use with standard concrete screw installation sleeves, which eliminate the need for drill adapters.
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