Blade length
The length of the cutting part of the scissors; in manual and similar models (see "Type") the cutting part is called sponges, in lever and guillotine models — blades.
When working on sheet metal, the long blades/jaws allow you to make a long cut in one bite, but impair the manoeuvrability of the scissors. Therefore, models with relatively long jaws (from 50 mm) are mainly used for straight cuts, and short scissors are more convenient for curly lines. Also note that in bolt cutters and other tools designed for large thick parts, the jaws are also made short — this design is optimal for working at high forces.
Steel grade
The grade of steel from which the scissors are made — or at least their cutting part (in some models, the material of the handles may differ from the material of the knives).
This parameter is most often indicated by the type of steel or by the main alloying components included in its composition. For example, the designation CS stands for "carbon" and refers, usually, to traditional unalloyed tool steel. Such steel is prone to corrosion under the influence of moisture, including atmospheric, so it is advisable to periodically lubricate such a tool and keep it in a place with low air humidity. Markings Cr-V and Cr-Mo denote steel with chromium-vanadium and chromium-molybdenum alloying additives, respectively. Both of these varieties are highly resistant to corrosion, while the addition of molybdenum allows you to also reduce weight without sacrificing strength. There is also a tool made of stainless steel marked SS; such an alloy contains only chromium as an alloying additive. Other types of steels are rarely used in metal shears; a description of such materials, if necessary, can be found in special sources.
