Wave Dampening Pedestal Uses a gas shock inside a mechanical spring to provide non adjustable wave dampening 12" anodized aluminum pedestal with 9" round base, 3-1/2" outer post with 2-7/8" inner post. Four grooves with keys to provide rotation lock and restrict movement, collar covers bushing and inner post keys. • Allows 3-1/2" of vertical travel • Developed and intended for recreational • Tested to ABYC H31 dynamic static loads Use with 2-7/8" Locking Trac-Lock™ Swivel • Adds 3/4" to height of pedestal Use with 2-7/8" Locking Trac-Lock™ Slide & Swivel • Rotates 360° & travels forward & backward • Adds 1-1/4" to height of pedestal