SINGING ROCK OXY Captive Bar TL Black climbing hardwareHot Forged Light Alloy Oval Carabineer With Removable Captive Bar. The SINGING ROCK OXY Captive Bar TL Black is designed for secure and reliable climbing setups, offering a combination of durability and ease of use. Constructed with high quality materials, this captive bar ensures that your gear remains firmly in place during demanding climbs. Its robust design is suitable for a variety of climbing applications, providing confidence and safety for