[Application]:This Fish Bit works great for running wire in finished ceilings and walls with minimal damage [High Quality Mtaerial]:our HUAALIUCHE installer drill bits are made from high quality material for long term use [Anti-slip end]:the fish bit was designed with a three flat tip shank to prevent slipping in chuck [Pulling Cable]: Drill bits 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]:9/16-inch head diameter, 3/16 inch shank diameter, and overall length is 36-inch [Flexibility]:‌36" Models‌: ▶ ‌Max bend: 60°‌ (risk deformation) ▶ Optimal ‌Bend ≤30°‌ (ideal), slowly rotate & push through walls/ceilings. 【Tips】 1.Use a low speed and a powerful corded drill. Control the torque to prevent overheating, jamming, or damage. 2.For a sharper edge, new bits can be ground to remove the coating. Sharpen them regularly as they dull with use to extend their life.