The Hook system integrates the functionality of the UnBlock manhole cover unblocker and can be alternatively mounted to the Rhino magnet on hybrid manhole cover lifter dollies (Speedy, Range and Cargo). Thanks to its interchangeable key system, it mechanically couples on all manhole covers equipped with at least one attachment point. Moreover, it allows manhole covers to be unblocked when they are seized by encrustations, even very thick such as tar, frost, asphalt, salt and various calcifications. It is equipped with a set of interchangeable pairs of key that are compatible with most of attachment points and accessories for removing dirt from manhole covers. The set of 12 keys supplied is completed by the following accessories: key, scraper, floor-protection plates, groove-cleaning tool, steel bar, key-holder spring.
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