Personal Grapple (5e Equipment)
From D&D Wiki
A small grappling hook connected to a 50-foot wire tightly wrapped around barrels. The grapple is designed to be worn either as a gauntlet or as a belt. The user pulls out a length of wire, releases a catch in the mechanism to allow it to unspool and be thrown, they can then reset the catch, hold the wire and swing.
Cost: 100 gp
Weight: 2 lb.