Think back to where you lost your last 10mm socket. Did you find the one that rolled under the fridge? Yeah, no that's not the last time... it was...ohh right, when it lodged itself somewhere in the cowling when you were checking why your MAF was throwing codes. Wouldn't it be nice if you had a backup when you needed it most? Includes chinesium 10mm socket, shiny metal neck chain & instructions.