A snap hook or carabiner closing devices are referred to, which are provided with a spring latch and a hook. Historically they were used by riders to attach the carbine, a short-barreled rifle, to the bandolier, a wide leather strap that ran diagonally across the shoulder of the upper body and there are a lot of snap hook wholesale shops from where you can buy them in a bundle.

Different Areas of Application – Different Snap Hook Systems:

Nowadays, stainless steel carabiners are used for climbing in the private sector. They are also used in filigree form and small in size in the jewelry sector as closures and are used in the commercial sector for fastening objects and for apparent load securing through nets that are stretched over open loading areas.

These different areas of application place specific demands on carabiners so that it is only possible to meet them by developing special forms of carabiners.

For safety-critical applications, Carabiners with an additional lock are used, as it must be ensured that accidental opening of the carabiner is almost impossible to ensure safety. The closure is a sleeve that, when open, rests on the latch and when closed is pushed over the connecting area between the latch and the nose to prevent undesired opening. 

As a further development of this carabiner system, the carabiner with a screw cap was considered, which must complete at least three turns to be released. These simple screw carabiners were used by the fire brigade for safety purposes, since the fire brigade is not subject to the norms common in Europe and, in contrast, to rescue at heights and caves, such carabiners can therefore be used legally in this area.