The Wirepoon is a specially-designed hand-held tool invented and used by the first Sandman, Wesley Dodds.
History
Held and fired like a pistol, it fires a needle attached to a length of thin, steel cable, which can be used to scale walls, slide down, or swing between buildings. It has a disentangling button which if pressed will emit a electric impulse through the wire cable, loosens the needle, and a quick pull by the user will yanks it free.[1]