а. Према величини дугмета (тј. величини пречника)
That is, we often say 14, 16, 18, 20, 60 and so on! Its conversion formula is: diameter = model 0.635 (mm). If we have a button in our hand, but don't know its size, we can use a caliper to measure its diameter (mm) and divide it by 0.635.
б. Постоји још један начин да се изрази величина дугмета, наиме Л
