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Material: carbon steel, a type of 4.8 grade iron, M6-M10 is multicolored galvanized, M12 is white zinc plated!The cylindrical inside gap is a threaded hole, compatible for screws and threaded shafts! Optical axis doesn't fit!Size:M6: Disc diameter: 37mm, cylinder outer diameter: 12mm, whole height: 17mm, base plate thickness: 2.5mm, 3 gap diameter: 5.5mm, pitch: 1.0mmM8: disc diameter: 37mm, cylinder outer diameter: 12mm, whole height: 17mm, base plate thickness: 2.5mm, three gap diameter: 5.5mm, pitch: 1.25mmM10: disc diameter: 37mm, cylinder outer diameter: 13mm, whole height: 17mm, base plate thickness: 2.5mm, three gap diameter: 5.5mm, pitch: 1.5mmM12: disc diameter: 40mm, cylinder outer diameter: 16mm, total height: 25mm, base plate thickness: 3.2mm, 3 hole diameter: 5.5mm, pitch: 1.75mm