Compatible with BLACK+DECKER String Trimmer-GH710, GH700, GH750 Easy Installation: simply push this trimmer head into the string socket and it automatically locks in place with assistance from the side push buttons For Best Use: avoid using this accessory for edging, working alongside brick, chain, or wooden fencing Products Include: The package contains 18 Pack Polycarbonate Blades Pls contact us first when you get some problem, we will offer you assistance asap THTEN DF-065 90517175 Trimmer Replacement Blades Compatible with Black Decker GH710 GH700 GH750 Weed Eater String 18 Pack