Vnútorný profil nadstavcov, respektíve kľúčov, je tvarovaný do mierneho oblúčika. Vďaka tomu je zaistené, že hlavná sila pri zábere pôsobí priamo na plochu skrutky, namiesto na jej hranu. Hlavnou výhodou uvedeného systému je menšie opotrebovanie skrutiek a jednoduchšia demontáž poškodených skrutiek.
CrV oceľ je typ ocele, ktorá sa vyznačuje vysokou pevnosťou. Ide o nástrojovú oceľ určenú na prácu za studena. Ako možno z názvu vyčítať, ide o zliatinu chrómu a vanádu, ale aj ďalších prvkov.
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