1. UPGRADED NEW DESIGN- With the latest design, the soft close mechanism operates sliding doors more quietly and smoothly. The invisible design can make the products hidden behind the rail, bring the door to soft stop in final position, in case of any slamming and fingers pinched, less force is needed to close the door. Designed for flat track but cannot be used for round tracks. 2. ACTUATOR SPACERS PROVIDED - Come with 4 additional spacers that can be used to bridge the gap between the actuator and the soft close set, which play the role in extending the reach of the actuator. No need to worry about finding blocks for yourself anymore. 3. Hole-Free Style - Hole-Free Version Barn Door Hardware Stopper, One-Way Operation. With the latest design of the soft close, there is no need to drill holes on the track or decide where to install screws. Simply attach the soft close to the back of the track with the hook and fasten it with the supplied hex wrench. 0.4-1" gap from rail to door. 4. & Smooth Closing - With our advanced soft close mechanism, opening and closing your barn doors becomes effortless. The smooth gliding motion requires minimal force, providing a seamless and enjoyable user experience. The soft close feature ensures a gentle and controlled closing motion, preventing slamming and reducing noise