Alvord Polk 8001 Series High-Speed Steel Core Drill, Straight Shank, Right Hand Spiral, 4 Flutes, 9/32 Inch Size: Core Drill Bits: Amazon.com: Tools & Home Improvement
Value Collection - Core Drill: 21/32″ Dia, 118 °, High Speed Steel - 01585421 - MSC Industrial Supply
Steel Dragon Tools® 3 inch (76 mm) x 6 inch Dry Diamond Masonry Core Drill Bit - Walmart.com