This is a newer style Miller Industries Control Handle Knob (old Style #12-0301429). It is grey in color and is labeled “In/Out” for wheel lift extendoperations. See Features for related wreckers and Brochures for referencecharts. Labeled In/Out Color: Grey Century 300 Series Holmes 400 Series Vulcan 804 Vulcan 806 Vulcan 807 Century Modular 211 Product Dimensions: 1.55″L x 1.38″W x 1.38″H Inner Diameter: 0.3″ Outside Diameter: 1.38″