Kevin Burns designed and engineered his fitting system to ensure customers get a proper fit every time. The arm takes measurements from your putting address position and uses proprietary software to calculate the correct length, lie angle and head weight for you. It's highly precise and easy to use; just grab the handle, assume your putting position and hold. Best of all, it works no matter whether you're a righty or a lefty, tall or short, portly or thin, male or female.