DESIGN CONCEPT: It was designed for Black & Decker string trimmer. With auto feed system replacement spool eases the tedious work of hand-winding spools. Automatically feed the cutting rope with centrifugal force, so that you are not so tired during mowing.APPLICATION: Line string trimmer replacement spool fits for Black & Decker GH700, GH710, GH750. The auto feed system replacement spool eases the tedious work of hand-winding spools.SPECIFICATIONS: Replacement trimmer line spool DF-065 DF-065BKP. Good value for money, easy for replacement. The specially engineered diameter of this line is 36ft 0.065 inch.Trimmer line replacement spool adaops high-quality ABS spool & durable nylon thread which is flexible and long service life. with CNC machine, the black and for decker trimmer spool is cut and winded automatically which will never get stuck during trimming.NOTICE: When you using this product, protective measures should be taken to avoid damage to the body caused by spilled wires. The product is only suitable for young grasses. For strong weeds, use other tools such as blades to trim.Material:ABS, nyloncolour:blackPackage Contents:4 * Spool lineOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.