Stanley 94-531 FatMax 25-Foot Tape Rule with Bonus Instant Change Knife On-Pack 11' Tape Standout Blade Armor Coating on the fist 6" maximizes durability of hook High-visability Mylar polyester film extends life of blade and improves measurement visibility High -impact ABS case w/ rubber over mold for sure grip and durability Knife is cast metal w/ bi-material soft panels. Blade changes w/ the push of a button - no tools required