Attwood's Snap-Lock 1.77" products provide great lock on quality while delivering a great combination of value and performance. All Snap-Lock series components snap and hold together. Posts are constructed from sturdy bright-anodized aluminum and include a larger locking clip with a metal insert that allows the posts to lock into bases for added safety; just press the button to release. Seat mounts have been designed to permanently lock into the post in any swiveling position.