SeaLux 18" Aluminum fishing measuring Bump board ruler Bump Boards allows for quick measurements right after your catch! Corrosion resistant, Durable, high-impact Anodized Aluminum construction Ruler features large, easy-to-read numbers molded into high impact Aluminum board, large enough to show up in photos. Get accurate measurement of all your fish for tracking your catch or qualifying catch for slot limits. 3/16 inch anodized aluminum plate, Laser etched for longevity