Features： 1、Suitable for brick walls, red bricks, foam bricks, hollow drills, etc., can be used to install air conditioners, range hoods or washing machines 2、Carbide core drill core is welded with high quality alloy, durable for a long service life 3、Combination of round alloy blades, each blade bears part of the workload, and cutting edges are not easy to appear 4、The kit includes 30mm, 40mm, 50mm core bits, and 350mm extension shank, easy to install 5、The product possess stable structure, performance and long service life Specification： Item Type: Concrete Wall Cutter Drill Bit Material: Overall: Carbon steel, Drill Core: Cemented carbide Handle: Round handle Hole Saw Diameter: Approx. 30mm / 1.2in 40mm / 1.6in 50mm / 2in Handle Length: Approx. 350mm / 13.8in Package List： 3 x Hole Saw 1 x Handle 1 x Drilling Core 1 x Wrench 1 x Screw 4 x Storage Box(random color)