Material: Super Carbide+CRV hard steel, Surface shot blasting to make the surface smooth, improve the surface hardness, strengthen the quality and reduce wear The SDS electric hammer bits are very durable and easy to use and drill holes in concrete quickly. With the 4-flute design, the drill bits removes debris quite efficiently SDS drill kit with good quality and high precision, milled u-flute with deep cut spiral for fast dust removal for both ease of use Size: 5mm*110mm/ 6mm*110mm/ 6mm*160mm/ 8mm*110mm/ 8mm*160mm/ 12mm*160mm/ 10mm*160mm/ 8mm*210mm. Used to drill into concrete and bricks or block with rotary hammer Suitable for drilling holes in ceramic tile, stone, wood, metal, aluminum, plastic, concrete and multi-layer materials