Application:This Fish Bit works great for running wire in finished ceilings and walls with minimal damage Flexibility:our bits are made from high quality material and the max flex is 90 Anti-slip end:the fish bit was designed with a three flat tip shank to prevent slipping in chuck Pulling Cable: Fish eye hole provided near tip of flutes to aid in pulling wire inside wall cavity from either direction after drilling, without damage to the wall Dimension:3/4-inch head diameter, 1/4 inch shank diameter, and overall length is 54-inch Tip: This drill bit is weakly flexible, the best use angle is 20-30 degrees.