Grip-Tite 00102 Non-Magnetic Grip Socket Set, 17-Piece Grip-Tite Sockets hold bolts and nuts straight and true, for easy installation and removal (not magnetic). Where conventional sockets spin, Grip-Tite sockets grip onto rounded bolts and nuts with ease. Covers 11 sizes: standard length sockets 3/8, 7/16 (and 11mm),-1/2, 9/16, 5/8 (and 16mm), 11/16, 3/4 (and 19mm); deep length sockets 3/8, 7/16 (and 11mm),-1/2, 9/16, 5/8 (and 16mm), 11/16, 3/4 (and 19mm), 13/16 Each deep socket doubles as a spark plug socket, protecting the spark plug ceramic body. Lifetime Warranty