High quality durable tungsten carbide tipped SDS plus drill bits. Plus, are the most popular type of SDS drill bits and can only be used in conjunction with a SDS plus power drill. They are ideal for drilling holes in light weight blocks, stone, concrete and masonry, when installing windows and doors. Stocked in diameters of 5mm to 8mm and lengths from 110mm to 450mm to suit a wide range of masonry fixings.