The Kor-O-Sel delivers an easy, effortless way to attach drill bits to core drill machines. The Kor-O-Sel wheels into position, and the free-spinning platforms are designed to help attach core bits to core drill machines effortlessly. Three models are available, for up to 8-in. diameter bits, up to 16-in. diameter bits and bits greater than 16 in.. Custom sizes also can be made. Kor-It Inc. 888-727- 4560.