FAQ: Q: What is the best core drill? A: Best Core Drill Top 5. PRODUCT FEATURES; TOP PICK: 1. Bluerock 4″ Z-1 Concrete Coring Drill Drilling Diameter: 4″ Dual Speed Handheld Unit: Check Price: RUNNER UP: 2. Hardin HHP+SET Hydro-Handle Diamond Core Drill Wet Core Drill Included bits: 1/4″, 5/16″, 3/8″, 1/2″, 3/4″, 1″, 1-3/8″, … Read more