sliders for a 4040 (or 40 x any) and 2060 (or 20 x any) extrusion for using it as a miter fence for your table saw.
Or any other reason you dont want the alu scratching on a surface

2 pieces, 40x100mm and 20x100mm. you can scale the length or just print more.
you can not scale the width

Tip; use in combination with 2060 endcaps