Package: 1 of 9/16 X36” flex installer drill bit, 1 of extra level, 8 of CrV 25 mm bits, 1 of magnetic bit holder. Description: Flex installer drill bit is perfect for drilling, making your work easier. Advantage: Our bits are made from spring steel, it is a Flexible shaft. Advantage: It’s a special design, that’s Self-feeding screw point. Application: Fish eye hole at both ends is aids in pulling line inside wall cavities after drilling, facilitating efficient line installation This flex installer bit works great for running line in finished ceilings and walls with minimal damage.