Step wedge calibration blocks supplied in Carbon Steel, Stainless Steel as standard but can be supplied in other materials required by Customer. 0.1, 0.2, 0.3, 0.4, 0.5, 1018 Carbon Steel or 304 Stainless Steel (I shall require 4 more various sizes of wedges displayed on the web site) Selection of Carbon steel or stainless steel for each wedge.