What measure of folding knife is legal in Spain?

According to Royal Decree 137/1993, January 29, Regulation of Weapons that regulates the possession, use, sale, advertising, circulation, import and manufacture of those considered non-fire weapons , it is allowed to buy non-prohibited cutlery items in establishments that are dedicated to the commercialization of this type of products and transport them to the home through the different means of transport. Regarding the use and possession, according to the current law, folding knives whose BLADE is equal to or less than 11 CENTIMETERS are totally legal, as long as they are used responsibly and in logical situations to use it, either to carry out a sports activity, hunting or of leisure in which you need to use the folding knife. You cannot take it, even complying with the legal measure, to go to places of entertainment (clubs, pubs, concerts, sporting events, etc.), demonstrations or any other activity incompatible with carrying the knife, or for personal defense. Folding knives that exceed 11 centimeters of blade can be marketed, but only for ornamental purposes or collection at home.

ATTENTION: Finally and in any case, the criterion of the agent of the corresponding authority will prevail, who will be the one who decides if even complying with the legal measure of the sheet, we can take it or not according to the situation, state or attitude of the person, etc...