Low Force Retractors are ideal for small items that need to be tethered underwater. With only a 3-oz retraction force, there is minimal resistance on the tool. You'll be streamlined and your gear will be right where you need it. Recommended for securing knives where a high retraction force could be dangerous. * Built to Last: Designed to survive extended salt water and chlorine exposure * Sand and debris are flushed from unit when operated in water.