BUL-Z-EYE™ 6 piece electrician's kit includes five different bit sizes, a 5-1/2 inch extension bar, and a convenient carrying case, giving you everything you need for drilling multiple hole sizes in any wood material. Twin cutting edges for superior cutting speed and ultra clean holes. Precision ground teeth with up to 50% wider cutting surface, provides clean and balanced cuts for maximum control. Robust replaceable lead screw with burr-free threads that feed the bit through the wood at a consistent rate. Precision machined shaft for bit concentricity to eliminate wobble and deliver a truer hole. Black oxide coated, heat treated and hardened for added durability. Quick-change shank for fast, secure change out.