Here is a breakdown of the OPK Submarine 9 system, translated from technical jargon into plain, everyday English.

What is this product?

In short: It is a hidden hardware kit that turns standard cabinet doors into sleek sliding doors.¹ It is designed for furniture (like wardrobes, sideboards, or media units) rather than full-sized room doors.²

The “Advantages at a Glance” (Explained Simply)

Here is the translation of the features you listed, focusing on why they matter to you.

1. “One for all / Different construction variants possible”

• What it means: It is a universal system.

• Why it helps: You don’t need to worry if you have a slightly unusual cabinet design. Whether you are building a new cabinet from scratch or upgrading an old one, this track system is designed to work with almost any layout.

2. “Inside Track Install / Retrofitted without milling”

• What it means: You don’t have to cut into the wood.

• Why it helps: Most sliding systems require you to use a router to cut deep grooves (milling) into the floor or ceiling of the cabinet to hide the track. This system simply screws onto the surface. This makes it perfect for DIYers because you can add it to a cabinet you already own (“retrofit”) without needing expensive power tools or woodworking skills.³

   

3. “Wooden doors thickness 16-25 mm”

• What it means: It fits standard wood sizes.

• Why it helps: It accepts doors ranging from about 5/8 inch to 1 inch thick, which covers almost all standard plywood, MDF, or solid wood panels used in furniture making.

4. “Tool-free installation, comfortable height adjustment”

• What it means: You can clip the doors on by hand and adjust them easily.

• Why it helps: Once the tracks are screwed in, you don’t need a screwdriver to mount the actual heavy doors—they usually clip or snap onto the rollers. If the doors look crooked (one side is lower than the other), there is an easy dial or switch to level them out without taking the door back off.

5. “Invisible damping / Fixable end position”

• What it means: It has a “Soft-Close” feature hidden inside the rail.⁴

• Why it helps:

  • Invisible: You won’t see bulky hydraulic pumps sticking out; the mechanism is hidden inside the track.⁵

  • Damping (Soft Close): When you slam the door, it catches it and gently pulls it closed the last few inches.

  • Fixable End Position: When the door is fully closed or fully open, it “clicks” into place so it doesn’t roll back open on its own if the floor is uneven.⁶

  > Note on your text: Your description lists “Soft close – No” in the “Included” section, but mentions “Damping” in the advantages. This usually means the capability for soft close exists in the design, but the specific kit you are looking at might require you to buy the soft-close mechanism separately. Be sure to check exactly what is in the box!

Summary of How it Works

To visualize how this installs:

1. The Tracks: You screw a rail to the inside top and inside bottom of your cabinet.

2. The Doors: You attach two wheels to the top of your door and guides to the bottom.⁷

3. The Action: The door hangs from the top rail and slides smoothly. Because the tracks are “Inside,” the doors sit flush inside the cabinet frame, giving it a very clean look.