Grapple glove

Grapple-Gloves are weapons/tools designed by the Autobot scientist Que for use by NEST. They fire a small razor sharp harpooned dart with a length of high tension wire attached to it. This allows them to be used for climbing.

Dark of the Moon film
Que gave these gadgets out just before the Autobots began fighting the Decepticons in Chicago. When Sam asked what Que's inventions were and did, Wheeljack quickly explained the usages of both the Boomstick and the Grapple-Glove.

Sam took two Boomsticks and one Grapple-Glove. As Sam, Epps, Carly and Epp's friends journied through Chicago, they were ambushed by Starscream. Epps and his friends ran into a building, while Sam and Carly ran down an alleyway that turned into a dead end. There, Starscream cornered them and readied himself to kill Sam. However, the dimwitted Decepticon leaned in forward, allowing Sam to shoot the Grapple-Glove's hook so precise that it dug into Starscream's optic,

Starscream began to violently thrash around, in great agony from his eye injury. Lennox tried grabbing Sam but Starscream was getting frantic and started throwing the two around. Minutes later, Sam stabbed Starscream's other eye with the self-destructing Boomstick. Seconds after the Boomstick was shoved into his eye, it blew up. Since Sam was still in posession of the Grapple-Glove at the time in which it had clinged to Starscream's eye, the rope attached to the hook was destroyed when the Boomstick exploded. This not only ended the Grapple-Glove and Boomstick's usages, but it also ended Starscream's life by blowing his head off.