Material: Hard alloy, Length: 3 * 110mm, 2 * 160mm The SDS electric hammer bits are very durable and easy to use and drill holes in concrete quickly SDS drill kit with good quality and high precision, durable to use With the 4-flute design, the drill bits removes debris quite efficiently Suitable for drilling holes in ceramic tile, stone, wood, metal, aluminum, plastic, concrete and multi-layer materials