Rolson Core Drill Bit used to create or increase cylindrical holes 

ValueHall Core Drill Bit Hollow Core Drill Bit Wall Hole Saw Concrete Hole Saw Hole Cutter with SDS Plus Adaptor and Centering Point Drill V7113 (68mm)

PRO 100mm (3.94”) Heavy Duty TCT Core Drill Hole Cutter Bit, ½” Arbor Connection for Power Drills & SDS – Masonry Concrete Stone, Builders, Brick Blocks - Loops

Product Description: 
The Rolson 24921 50mm core drill bit has been tungsten carbide-tipped and copper brazed. It is ideal for use on concrete, brick and other construction applications. This is supplied with an 8 x 110mm pilot drill and a 100mm SDS extension.

Features: 

• Tungsten Carbide Tipped
• Copper braised
• Supplied with 8 mm x 110 mm pilot drill and 100 mm SDS extension
• Ideal for concrete, brick and other construction applications

Technical Specifications: 

• Manufacturer Rolson
• Part Number 24921
• Item model number 24921
• Batteries Included? No
• Batteries Required? No

What is a Core Bit?: 
Drill bits are cutting tools used to create or increase cylindrical holes. They are held in a drill to rotate them, which provides torque and axial force to create a hole in the material you’re drilling. A core drill bit can be used to enlarge an existing hole. The name comes from its first use, for drilling out the hole left by a foundry core, a cylinder placed in a mould for a casting that leaves an irregular hole in the product. A core drill bit is similar to a reamer as they don’t have a cutting point or means of starting a hole. They have 3 or 4 flutes which enhances the finish of the hole and ensures the bits cut evenly. Tungsten carbide and other carbides are extremely hard materials that can drill in virtually all materials. Due to their brittleness they are mainly used for drill bit tips, small pieces of hard material fixed or brazed onto the tip of a bit made of less hard metal.