【Carbide Drill Bit】:This eccentric drill bit head is made of tungsten steel, with extremely high hardness and wear resistance.Advanced precision instruments are used to cut the drill bits to reduce burrs. The surface of the drill bits is coated with electrophoretic paint to prevent corrosion and rust, which greatly extends the storage and service life. 【Upgraded Stepped Head Eccentric Drill】:MORETOPGOOD high-strength eccentric twist drill bits are precisely positioned to prevent slippage during drilling, improving accuracy and work efficiency.The head has a four-sided staggered stepped cutting edge that utilizes the working principle of small-diameter drilling and large-diameter reaming when in use, better cutting material and chip removal, greatly improving drilling speed. 【Widened U-Shaped Chipconveyor Design】: The masonry drill bit shank has a widened U-shaped groove for quick discharge of accumulated chips.The drill bits are of hexagonal shank type, which is widely used and held more securely. 【Package Includes】: This upgraded masonry drill bit set includes 5 pieces in various sizes:1/4 inch(6mm)x2 + 5/16 inch(8mm)x1 + 3/8 inch(10mm)x1 + 1/2 inch(12mm)x1. multiple sizes to solve your different work needs. 【Versatile Applications】Multi-Use Drill Bit, can easily work with different materials. Suitable for drilling into ceramic tile,marble, glass, brick, concrete, plastic or wood,Its versatility makes it the perfect everyday tool choice for a variety of DIY projects.Note: Please add water when drilling for smoother use. MORETOPGOOD Masonry Drill Bit Set for Ceramic Tile, Concrete Drill Bit with Tungsten Carbide Tip for Marble, Cinder Block, Glass, Brick, Metal, Cement, Concrete, Plastic, Wood, Granite and Wall,5PCS