Aqueon ProScraper 3.0 Twist & Click Stainless Steel Blades work with any Aqueon ProScraper 3.0. Replacement blades are a great option for when current blades become dull or worn down. No need to replace your whole scraper. These blades are great for cleaning hard to remove algae from glass aquariums. The Twist & Click design makes it easy to switch your blades or replace them when they become worn. To change the blade, click out the tabs from the head, twist blade and remove. To replace the blade, insert blade at an angle, twist and click in the blade tabs to lock into the head.