SDI-1361 9mm Snap-off Precision 30 Degree Sk2+cr Blade, 20-Blades (2 Packs) 30 Degree Blade made from special Sk2+cr steel from Japan and designed for unparalleled sharpness and superior edge retention. Acute 30-Degree angle blade making it a popular choice with professional graphic artists, window tinting, and sign-making professionals. Precision cuts on cardboard, plastics, coroplast, foam board, gator board. Artist recommended product. 20 replacement Snap-Off 30 degree Blades. A Blade Dimension : 3.5 Inch L X 0.375 Inch W.