[What you receive]you will get 10 pieces glass concrete drill bit set with 6 different sizes, this drill bit fits the majority of power drill currently on the market and come with a portable plastic case for easy storage and organization. [New upgrade materials]the masonry drill bits are made of YG6X alloy with anti-rust treatment, more sturdy and more reliable, anti-rust and wear-resistance; with a reinforced head and nice hardness prevent bit cracking, it can provide a life [Hexagonal handle for quick change]designed with 1/4 inches hex , the carbide tip drill bit can be applied to all power tools more easily and securely, which will drill faster and smoother, saving your time and efforts [Wide applications]tungsten carbide tip work with ceramic Tile, wall mirror, on concrete or brick wall the drill bit set can be applied to drilling glass, tile, , wood, marble, concrete, etc.;You should note that you have to remember to add water or coolant when drilling continuously Colour:black Material:Carbide Package Contents: 1X 5/32inch (4mm) Drill Bits 2X 3/16inch(5mm) Drill Bits 3X 1/4inch (6mm) Drill Bits 2X 5/16inch(8mm) Drill Bits 1X 3/8inch (10mm) Drill Bits 1X 1/2inch(12mm) Drill Bits Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.