Specification model:

Heavy load [chain * 1 + guide plate * 1]]

20-inch anti-burn model [chain * 1 + guide plate * 1]]

20-inch anti-burn model [chain * 2 + guide plate * 1]]

20-inch anti-burn model [chain * 3 + guide plate * 2]]

20-inch version [chain * 1 + guide plate * 1]]

20-inch version [chain * 2 + guide plate * 1]]

Heavy-duty [bare metal] factory standard

20-inch version [chain * 3 + guide plate * 2]]

Enhanced [bare metal]]