The PCNSTART drill bit is a versatile tool used in masonry core drilling. It is designed to be installed inside the Thunder Core masonry core bit, which helps to break up concrete or stone, making the drilling process easier and more efficient. The starter bit allows the core bit to cut its path with less pressure, resulting in a longer-lasting core. The PCNSTART drill bit is available in various sizes and is compatible with SDS rotary hammer drills, making it suitable for large hole drilling where the depth is relatively shallow.