The chain must come with a master link that is designed for that specific chain.
You must always have the specific master link for that BRAND and TYPE .
A DID' and RK' chain both being a 420 chain can have very different MFG' sizes of pins and rollers and side plate thicknesses .
Even a DID Chain of the same size can have different size master links from one TYPE of chain to the next / See bottom of Pic , (in red)
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