Positive lock slider and spider combination, left hand lever with plain finish 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 Internal Delrin cup provides smooth, gaul-free operation Internal cup engages in 10° increments for positive stop-lock 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