You get 4 screws for your hard drive. These requires a Torx T6 screw drive to install.Compatible with:13" MacBook Aluminum Late 2008 Model: MB466LL/AMacBook Pro 13" Unibody Body Model A1278 including Models:MB466LL/AMB467LL/AMB990LL/AMC374LL/AMB991LL/AMC375LL/AMC700LL/AMD313LL/AMD101LL/AMC724LL/AMD314LL/AMD102LL/AMacBook Pro 15" Unibody Body Model A1286 including Models:MB470LL/AMB471LL/AMC118LL/AMC026LL/AMB985LL/AMB986LL/AMC371LL/AMC372LL/AMC721LL/AMC723LL/AMD318LL/AMD103LL/AMD322LL/AMD104LL/AMC373LL/AMacBook Pro 17" Unibody Body Model A1297 including Models:MB604LL/AMC226LL/AMC024LL/AMC725LL/AMD311LL/A