・M6 bolt ・・ Mainly for 12Φ pins (pin inner diameter 6Φ or more and 9Φ or less, pin outer diameter 10.5Φ or more) ・M8 bolt: Mainly for 14Φ pins (pin inner diameter 8Φ or more, 10.5Φ or less, pin outer diameter 12.5Φ or more) ・M10 bolt: Mainly for 16Φ pins (pin inner diameter 10Φ or more, 13Φ or less, pin outer diameter 14.5Φ or more)