A stainless fastener with a shackle-buckle consists of two elements. The first one is a metal pin used for latching on to the aluminum railing of the training wall; this goes together with a ring protecting from accidental unlatching. The second one is a shackle-buckle or a buckle with a movable clamping bar, which is at the same time unscrewable like a sailing shackle.
We latch the fasteners onto the yoga wall at the selected height and fasten the ring protecting from accidental unlatching. Next we attach to the fasteners the harness or the belts with wooden handles with extensions.
The movable bar with grooves increasing friction clamps the belt the harder the more it is pulled by the exercising person.
The width of the buckle is adjusted to the 30 mm belt (such as the one used in the harness or the one we sew on as extensions to the belts with wooden handles) and is compatible only with such belts.