Amazon.com: Sabre Tools 1-1/4 Inch x 18 Inch SDS Plus Rotary Hammer Drill Bit, Carbide Tipped for Brick, Stone, and Concrete (1-1/4" x 16" x 18") : Tools & Home Improvement
DEWALT 1/4-in 4-1/16-in Cobalt Alloy Steel Jobber Length Twist Drill Bit in the Twist Drill Bits department at Lowes.com
4 inch Concrete Drill Bit (Closed-Head) - Gilson Co.