Caldwell Prone Bipod, 8 3/4-12-Inch, Black Easily Attachable and detachable from the front swivel stud Lightweight aluminum design or quiet, weatherproof performance Built-in swivel pan feature left or right 20 degrees combined with an 18 degree bi-directional cant Stud for Sling attachment Easily attachable and detachable from the front swivel stud Lightweight aluminum design for quiet, weatherproof performance Built-in swivel pan feature left or right 20 degrees combined with an 18 degree bi-directional cant Stud for sling attachment Folds out-of-the-way when not in use