The advantage of the armlock is multifaceted but the main benefit is increased face control. Orientate SIK grip parallel to the putter face for maximum contact points, ensuring a stable and square setup from address through impact.
Descending Loft Technology is patented putter face technology. Four flat surfaces that are milled into putter face. Each plane descends in loft by 1ْ from the top of the face to the bottomof the face. When your shaft is pressed at impact the ball contact will be higher on the face, same is true in reverse. DTL delivers consistent launch angles from putt to putt which lead to more consistent and predictable rolls.