Get the Lock on Quality. The 1.77" group delivers a great combination of value and performance. All Snap-Lock series components snap and hold together; Posts are sturdy bright-anodized aluminum; Seat Mounts are E-coated for superior construction; Available in a wide choice of bases, sizes, and materials ; The Swivl-Eze Difference Type A/Operator models have ergonomic swivel-locking handle with stainless steel components; Seat mounts have been designed to permanently lock into the post, in any swiveling position.; All posts include a larger locking clip with a metal insert that slows the posts to lock into bases for added safety. Press button to release.; Both the snap-lock and locking clip are engineered to prevent unintentional detachment; Posts are sized on both ends for a precision fit; Meets ABYC H31.6.1;