• 16 - 24 INCH • Ideal for cleaning scratched glass or acrylic. • Rubberized handles and blade attachments made from strong abs plastic and stainless steel that will not rust. • Plastic blade gently scrapes off most naturally-occuring algae without scratching the glass or acrylic surface. • Steel blades work on hard coralline algae and calcified deposits. • Metal and plastic blades are interchangeable and replaceable. • Extendable handle length is easy to adjust with a simple twist.