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This is a 260mm caulking gun which is a steel skeleton frame which has a steel handle with plunger and quick release lever.
It is suitable for most sealant cartridges which are 300ml to 380ml capacity. The maximum length of sealant cartridges which you can insert into the gun is 10" (260mm) long.
Known sealant cartridges which are known to fit in the Rolson gun are;