SNAP & GO: Aero-Flex Snap & Trim convertible head does not require any retrofitting. Snap in replacement head and begin trimming. EASY RELOAD: Aero-Flex line blades can be reloaded in a fraction of the time as frustrating trimmer line. No spools. No springs. No rewinding. Just snap and replace. FLEXIBLE BLADES: Aero-Flex line blades are flexible, safe, and maintain their durability when cutting. EFFICIENT: Patented aerodynamic blades designed to slice through dense vegetation allow you to run your trimmer at half speed while finishing the job in half the time. GROUND-CONTROL GLIDER: Allows heads to rest on the ground reducing weight, controls cut height and scalping. INCREASED CUTTING CONTROL: Neon-colored blades allow you to see your cutting radius. So you only cut what you want, where you want. MADE IN THE USA: Produced in the USA, the AERO-FLEX fits most gas/battery-powered trimmers (see list). CRAFTSMAN & BLACK + DECKER COMPATIBLE BLACK & DECKER: BCASK890E1, BEST935, BESTA510, BESTA512, BESTE620, CST1000, CST1100, CST1200, CST2000, GH400, GH500, GH600, GH610, GH900, GH912, LCC140, LCC221, LCC222, LCC2223ZP, LCC340C, LST1018, LST120, LST126, LST136B, LST140, LST140C, LST201, LST220, LST300, LST400, LST420, LST522, LSTE522, LSTE523, LSTE523, MTC220, MTE912, NST1018, NST1024, NST1118, NST1810, NST2018, NST2118, PS76110A, ST6600, ST7000, ST7200, ST7700, ST7701, ST8600, ST9000 CRAFTSMAN: CMCST900D1, CMCST910M1, CMEST900, CMEST913, CMESTHOS912, CMST915C1 Compatible with Craftsman & Black + Decker models only. Elevate your landscape with the Snap & Trim Aero-Flex trimming system. Our new snap & trim technology replaces the retrofitting process. Simply snap the new system in place of your trimmer’s spring and spool. This one-of-a-kind lawn care enhancement tool simplifies reloading your trimmer, while increasing it’s power, maneuverability, and efficiency. Aerodynamically designed and engineered to perform best at low speeds, our flexible yet durable blades last longer than traditional plastic string and can be easily replaced without the hassle of spools, springs, or rewinding. Compatible with both battery and gas trimmers, the Aero-Flex system adds power to every cut. With the addition of the ground-control glider, you can turn your trimmer into a small plot mower. The glider allows you to rest your timber on the ground, saving energy and reducing fatigue, while maintaining optimal height from the ground so you can control the height of your grass. Plus, the neon-colored blades allow you to see your cutting radius, ensuring you only cut what you want, where you want. The Aero-Flex system is proudly produced in the USA.