Makita 752175-A is a 4 inch diameter Rotary Hammer Core Bit heavy-duty drillingMakita 752175 A is a 4 inch diameter Rotary Hammer Core Bit heavy duty drilling Product Details Item: Rotary Hammer Core Bit Diameter: 4 inches (approx. 101. 6 mm) Shank Type: Designed for use with No. 2 threaded shanks. Application: These core bits are typically used with Rotary Hammers for drilling through masonry, concrete, and brick. Compatibility: It is part of a system that often requires separate components like center pins (e. g., R24b) and