Diethrich vascular scissors are made from 420SS with a 90 degree angle and are 170mm in length.

Good scissors should retain a sharp edge. That requires a tough and hard stainless steel. One of the best and most suitable steels for scissors is AISI 420 Japanese Stainless Steel.
Different scissor styles are required for specific applications. So the Smith scissors are a solid, strong universal type. For fine control the length ratio of blades versus handles from the pivot point is important; relatively longer handles give better control. Smaller scissors can move into restricted openings and don't obscure vision.
The scissors on this page are well made with a matt, brushed finish. They are a 'Best Buy' and compare well with very expensive, name-brand surgical scissors.