Appleton’s new Instant Diameter Change (IDC) mandrel system enables core cutting of multiple core diameters with a single mandrel and interchangeable sleeves. The operator-safe IDC system allows for quick and easy diameter changes without tools and without having to handle heavy mandrels. This means operators can easily change core diameters without incurring the downtime and operator risk caused by changing the mandrel. This technology not only eliminates the need for multiple mandrels, but also eliminates loose parts and head jaw or pad adjustments, making it an efficient system for cutting multiple diameters. As a universal add-on system, the IDC fits all existing Appleton core cutting machines.