The Snap-on Metric/SAE Magnetic Socket Holders contain 30 percent stronger magnets than the company's previous model, and are available in four colors (red, black, green and orange) and in three different drive sizes: 1/4", 3/8" and 1/2" drive. These socket holders are designed to fit standard chrome and impact sockets. Rubber over-molding keeps sockets in place, and techs can locate the right size with easy-to-read size indicators.