1.Multi-Compatibility: Compatible with Black Decker trimmer Model : GH900, GH912, GH600, GH610, GH400, GH500, NST2018, NST2118, NST1118, NST1018, NST1024, NST1810, LST220, LST201, LST300, LST400, LST420, LST136, LST120, LST140, LST1018, LST522, LSTE523, LSTE525, ST6600, ST7000, ST7200 2.Upgraded Blade Accessories: This upgraded weed eater replacement head can only be used with plastic blades for now, not s with trimmer spools. This product kit will send 10 plastic blades. The advantage of plastic blades is that they are more durable than trimmer wire while cutting faster, but they are also consumable. The trimmer head we changed to nylon material, which will be more durable 3.Products Include: The package contains 10 Pack Polycarbonate Blades and 4 Set Screw, 1 Pack Trimmer Head,1 Pack Tool wrench 4.For Best Use: Avoid using this accessory for edging, working alongside brick, chain, or wooden fencing, Stay away from rocks or other hard landscaping as they will break easily 5.Note: Avoid using this accessory for edging, When you are using a blade, it is only suitable for cutting weeds on a horizontal surface. Because the blade breaks too easily when cutting vertically. When cutting vertically, we recommend that you replace the trimmer blade with a trimmer spools 1.Multi-Compatibility: Compatible with Black Decker trimmer Model : GH900, GH912, GH600, GH610, GH400, GH500, NST2018, NST2118, NST1118, NST1018, NST1024, NST1810, LST220, LST201, LST300, LST400, LST420, LST136, LST120, LST140, LST1018, LST522, LSTE523, LSTE525, ST6600, ST7000, ST7200