The Grappling Hook is a tool in Starbound that allows the player to cast a line to swing, be pulled up or over to another platform. It can be crafted at a replicator using 20 durasteel bars and 4 climbing rope.
Grappling Hooks can be dual wielded, allowing the player to hold to a surface with one hook while casting another, or to shoot or swing a weapon while moving with the hook.
Can be controlled with W and S to raise and lower yourself. Jumping while in the air will disengage both hooks. Hooks change color when dual-wielded; blue for left-handed, red for right-handed.