The scraper is a multiple use blade cleaner. The 5.9" (15cm) wide blade makes it easy to remove even the most resistant calcerous algaes from the aquarium glass. The blades are manufactured from corrosion resistant hardened steel. The removable blade protector also acts as a squeegee for cleaning the outside of the aquarium glass. A unique feature of the scraper is the hinge which allows the blade head to be turned for 180°. This facility allows the user to still clean the aquarium even when the tank decoration - such as rocks or roots, comes very close to the glass.