Keep your hair trimmer sharp and dependable with the Andis 04521 Pro T-Outliner Replacement Blade. Designed to fit the GTO, GTX, GO, SL, and SLS models, this blade is made of sturdy carbon steel. With no attachments, the replacements blade will trim hair to 0.1 millimeters long. It can also be paired with attachments for longer beard and hair trimming.