Description:1. Designed for drilling soft brick, soft masonry, concrete block, granite, rebar concrete and other hard material.2. Cut perfect circles. Features thicker walls to minimize loss and improve durability.3. Core drill bit with hard and sharp material to cut faster than previous hole saw.4. Wide slots placed low on each hole saw and multiple leverage points to make it easy to work plugs out with a screwdriver. Specification:Product Name: Diamond Core Drill BitMaterial: Diamond, Carbon SteelHole Diameter: 30mm / 1.2"Drilling Depth: 57mm / 2.24"Shank Diameter: 10mm / 0.4"Total Length: 83mm / 3.27"Package Content: 1 x Diamond Core Drill Bit Please note:1. Can be used with bench drill, hand electric drill. When you using hand electric drill, make a mark in 45 degree angle, after that you can drill in vertical.2.