Why Replace The Blade:Trimmer usage over time will cause the blade to gradually dull. We recommend replacing your blade every 2-3 months to keep it sharp and efficient. FIT Model:#2111 Blades Detachable Clipper Replacement blades Compatible with Wahl MagTrimmers 8841/8143 /8700,Fits Sterling Mag 8779 and Beret 8841 Trimmer Premium Professional Blade: Professional Detachable Hair Clipper Replacement Blades delivers the sharp performance that experts demand.But Blades are not adjustable to a zero-gap, intended for professional use only Heat Resistant: This blade is heat resistant, cooler and more comfortable for smooth cutting. was a good experience Customer Support: If any blade set you purchased does not fit your hair clipper, please contact us any time, we will reply within 24 hours #2111 Blades Detachable Clipper Replacement blades Compatible with Wahl MagTrimmers 8841/8143 /8700,Fits Sterling Mag 8779 and Beret 8841 Trimmer