Multiple hand holds, shaped like metallic bars, were on the sides of corridors aboard J-class freighters and NX-class starships. (ENT: "Broken Bow", "Acquisition", "Horizon", et al.) The Earth Starfleet vessel Enterprise NX-01 featured hand holds in all areas of the ship including the bridge, the situation room, the command center, sickbay, and the launch bay. (ENT: "The Catwalk", "Regeneration", "Impulse") In 2233, the bridge of the USS Kelvin also featured various hand holds. (Star Trek)