Garelick Millenium Series - Seat Slide System - Ribbed SeriesFeatures: Low profile design allows 360 of rotation and 6" of smooth, wobble-free fore and aft travel; Heavy duty anodized aluminum slide plate has standard 5"x12" hole pattern to accommodate standard seat mounting holes; Positive Lock Spider rotates 360, internal cup engages in 10 increments for positive stop lock (Secondary twist control offers variable drag adj. and can be tightened to lock in place); Internal Delrin cup provides smooth, gaul-free operation.; Available in either left- or right-hand operation; Meets ABYC-H31, Type A Standards & Garelick performance standards; Includes retaining hardware (99302); Plain or powder coated finish; Specifications: 20000 : Positive Lock Slider & Spider Combination Left Hand Lever Plain Finish; Installation Instructions