◆ Safety guarantee: 4 times safety factor

-- The length difference of the chain limb is denoted by "D", and the unequal length chain is denoted by "B" -- chain diameter, mm

-- The number of limbs, in Arabic numerals 1,2,3,4... Indicates. Single limb can omit the mark. -- Chain connection type: welding chain with "H", mechanical connection chain with "".

-- Chain code Special chain code, binding chain, ring chain and metal billet chain are respectively denoted by K,H and P, general chain code: "L" can be omitted