From Halopedia, the Halo wiki
An antigravity grappler, often shortened to antigrav grappler, is a Covenant tool used mainly by Yanme'e workers. They are hand-held devices used in mining and excavation operations, allowing their users to effortlessly move large pieces of rock or ore through powerful antigravity fields. The effects of the antigravity grapplers are amplified when many are used in synchrony and trained on a single target. The combined antigravity fields emitted by several antigravity grapplers are capable of lifting a fully-armored Spartan in the air.
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