package: 9/16*54 inch fish bit The drill bit has flexible combination screw point installer bit. The ultra sharp threads provide better pulling power and faster drilling speeds. It moves quickly through obstructions. This drill bit is recommended for use when drilling through wood walls or drywall. self feeding screw point. Three flat non-slip grip on the chuck end. Flexible shank. Wire fishing accommodation holes Attention: 1:the head of the bit maybe broke off when it got stuck in the hole with the accumulated wood shavings 2:If you overpower most drill bits, they will break. In order to not break it, when you feel it not wanting to turn, back it out and try again. That?s what we suggest and it worked perfectly 3:the function of the drill ball:Worked great in combination with a drill bit ball on it to help keep the tip from drilling too close to the edge while inside the wall 4:drill it carefully going forward and backward to avoid the drill bit getting stuck in joist? if it snags or sticks, back it out and try again. Do not force the bit Safety Information Always wear approved eye protection.Never use on or near live electrical circuits. Note : Read and follow safety instructions in power tool owner's manual. 5:Wood Applications the sharp threads give this bit the best pulling power available. to moves quickly through some of the hard wood, the nail will damage the bit and get dull or even broke when hit the nail