5 & 5.5mm RID CYL Masonry Long Life Drill Bits
These RID drill bits from Bosch are made for use with masonry and brick work. They are made of strong materials and are expected to have a longer life than standard drill bits. These drill bits are great for drilling pilot holes, plug holes and wire pass through as they are a great general purpose masonry drill bit.
These drill bits come in sizes 50/85mm and 90/150mm for both diameters and are sold per 1.