Don't waste any time wondering if that fish is a keeper. The Danielson Aluminum Fish Ruler has clearly etched measurements to help you to quickly check fish length, and it also features convenient pre-drilled holes so you can easily stow or mount it exactly where you need it. Constructed from durable aluminum, the Danielson Aluminum Fish Ruler won't bend or rust out either for years of reliable use. Danielson - Delivering Quality Fishing Tackle since 1943.