Anodized Aluminum Blanks 160 x 25 x 3mm are used to mount 6" sharpening stones for guided knife sharpeners. Blanks are made of high-quality 3mm-thick aluminum with 45-degree bevels (Edge Pro form-factor) and color anodizing. Blanks are available in six colors: graphite gray, black, deep ruby red, ocean blue, emerald green, sepia orange. Different colors of blanks will help to avoid mistakes of using wrong grit.