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Colour Code Shrink Sleeves Using several PM screwdrivers preset to different torque values? Color coding sleeves keep your preset torque wrenches identified. Use a different color for each torque, and tell the operator which to use for what application. How simple! Color coding is a fast and effective means of identifying the correct tool for a specific use. These shrink sleeves are suitable for use on the shaft on SR preset torque screwdrivers, and come in five colors.