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Our former type of sleeve anchor used to cooperate with most influential brand around the world. When time goes by, JOKER anchor came out with a better design SLEEVE Anchor to our end users. With special design patent sleeve, end user could easily twist and install the anchor without a drop of sweat. In addition, owing to the paten code inside the sleeve, JOKER’s sleeve anchor would make sure that the sleeve would perfectly expand inside every kind of cracked and non-cracked concrete.