Designed to remove and insert spark plugs with ease using magnetic rings to hold plug in socket while installing or removing it. Set is made up of 12 magnetic sockets with a satin finish, all laid in a black and green EVA foam with labeled sizes. Each socket is conveniently knurled to allow the tech to turn by hand if needed. The set includes 2 12 point 14mm sockets that can be easily identified by the split between the knurling to save the tech time