Armeg Cable Guide Drill Bit for guiding cables through cavity wall. It is produced using our premium quality Sheffield manufactured Qfds drill bits for strength and durability. 2.5mm diameter precision machined holes in the drill shank and drill tip allow cables to be connected to the drill bit and simply pushed or pulled through the cavity. Elongated drive slot enables the cable hole to be drilled at the products strongest point for durability. Cables also lie flex at in the recessed slot meaning wire can be smoothly pulled through walls without snagging. Specifically designed to either 400mm or 600mm length to enable access through a cavity wall. Cable guide drill bits can be used in brick and block constructed walls (not designed for engineering brick or concrete), thick and stone walls (16mm dia).