Newly Trimmer Spool 4 Pack Cap Spring Replacement For Black Decker Cap Spring Lawn Mower Grass Trimmer Accessories Compatible with most Black and Decker String Trimmer models: GH400, GH500, GH600, GH610, GH900, GH912, ST6600, ST7000, ST7700, CST1000, CST1200, CST2000, MTC220, MTE912, NST2018, NST1118, NST2118, LST40, LST30, LST40, LST30 LST420, LST136 Pliable and flexible allowing for the line to stretch and cushion on impact with hard surfaces The trimmer replacement spool is compatible with Black+Decker string trimmer and utilizes centrifugal force to feed the trimmer line as it is needed The auto feed system replacement spool eases the tedious work of hand-winding spools 1. Due to different monitors and lighting effects, the actual color may be slightly different from the image 2. Due to manual measurement, please allow 1-3cm deviation Dimensions: wire length 9.144m*1.65mm coil cover 86*34mm spring 23*36mm Delivery color: as pictured Quantity: 1 set (coil*6+cover*1+spring*1)