Diamond 4 inch Concrete Hole Saw Masonry Core Drill Bit Heavy Duty for Brick, Cinder Block Standard Shank Drilling Holesaw Tool

The product is a core drill bit for drilling through hard materials like brick and concrete. According to some reviews, the bit is sturdy and works well with a Constant flow of water. However, starting the hole could be a challenge because the product does not have a center drill bit. The product should fit vent pipes one size larger for a more comfortable passage. In some cases, the product lacks grit and cutting power, making it difficult to drill through some materials. In such cases, it snaps off after just a few seconds of use. Also, the quality of the drill is questionable, according to a few reviewers, and one might need to pay more for an efficient and effective hole driller.