135-degree and twisted design-self-centering improves cutting speed, prevents walking and removes debris and particles faster. full grinding ensures the smooth movement of chips. High-quality materials-multifunctional universal drill set, high-speed steel, black and gold resistance and increase the hardness of the drill. Professional and widely used-suitable for metal/wood/plastic drill sets. Suitable for home DIY and general building/engineering/woodworking. Storage rack-The set includes a drill bracket with a size index, which is convenient for storage and sorting., Manufacturer: Akfldms