New (to me) sliders… a lot girthier than the stock ones.
Hit them with a nice coat of bed liner before installation. Easier to touch up as they get scraped 👍
Aluminum extrusion is available with t-slots on 1, 2, 3, or all 4 sides, and anodized clear or black. Black will discolor over time.
The selection of profiles is endless, and each manufacturer has their own t-nuts for mounting.
I use it a lot at work.