- Country of manufactureRussia
Rozhkovy keys will widely be applied thanks to relative universality and simplicity, despite serious shortcomings. The main lack of a rozhkovy key - only two small zones of contact which are close with nut corners. Pressure upon these zones seeks to crumple corners if the size of a pharynx is slightly more than the size of a nut, then the key will directly press on two corners and at effort will crumple them. The same will occur when the key is the correct size, but effort will be much bigger. With reduction of thickness of lips, the probability to crumple corners increases.