Perfect Pitch Golf Putter Cube Swing Trainer Great putters setup with their forearm on the same angle as their putter shaft This allows the arms and the putter to swing in unison producing a straighter stroke The Putter Cube ensures that you do this correctly By positioning your wrist against the Putter Cube your forearm and putter shaft are setup correctly Any good putter will tell you that you need to maintain your wrist angle through impact to be successful