4.25in Diamond Hole Opener with Positioning Bit 5 8‑11 Thread Core Drill Bit for Concrete Marble

Feature: 1. UNIVERSAL THREAD: This coring drill bit has 5 8‑11 universal thread, can be easily and quickly assembled to a standard fixed coring or handheld drill press. 2. EXCELLENT MATERIAL: The core drill is made of excellent alloy steel, wear resistant and durable, the diamond abrasive grains can ensure a longer core life. 3. HIGH PERFORMANCE: This diamond coring drill bit features chip evacuation holes, highly regular serrations and concentric shaft design for efficient operation. 4. EASY OPERATION: This hole opener bit can be used for both dry and wet drilling, drilling from a vertical position and going deep to meet a variety of needs. 5. WIDE APPLICATION: Ideal for drilling holes in concrete, brick and marble, often used to install air conditioners, plumbing, balustrades and buildings, etc. Specification: Item Type: Core Drill Bit Material: Alloy Steel, Diamond Thread: 5 8 11 Drill Diameter: Approx. 108mm 4.25in Length: Approx. 240mm 9.5in. Package List: 1 x Diamond Bit1 x Positioning Bit1 x Hex Wrench1 x Saw Blade1 x Gasket