The new flat bottom holder with cartridges for modular parting and grooving is extra compact and provides a quick and smart connection. Cartridges usually demand a large area to engage on a given tool. These new cartridges have a unique connection which enables the flat bottom surface on the holder. The cartridges engage firmly and prevent movement during the cutting application. The cartridges are highly flexible and can be interchanged on one shank. The through tool high pressure coolant enables shorter machining times and excellent surface quality, while assuring high repeatability. The toolholders are available in right or left-hand options. They connect with GRIP type cartridges.