Text Box: As with most of our products, the core bits we build are usually ordered by contractors who are very familiar with specific core bit designs and features that they want or don't want in their core bits. We do not list a "standard" core bit design list because it is impossible to cover all possible custom types. Our Matrix bodied PDC core bits can be ordered with almost any feature you can imagine and is available with any size or combination of sizes of PDC cutters.