UpToDateTools Package Includes:- 3 x core drills (30mm, 40mm, 50mm) 1 x 300 mm Rod shank 1x drill bit Durable Materials - Made of premium 40Cr steel and tungsten alloy, this hole saw bit kit provides years of service even under harsh service conditions High Quality - Made of a hard-tipped metal material with super robustness and durability, it can be used for many years in the harshest conditions without any loss of performance. Excellent design - high frequency welding technology, very strong welding joints, smooth inside and outside welding joints. Wide range of applications - This masonry hole opener kit can easily drill through the most common wall materials (brick, adobe, concrete, cement and stone) so that you can install AC pipes, water pipes, exhaust hoses, and more!