Lap/Table stand from RolaFrame. Fits up to 18in rollers.

If you want a wide frame, you can purchase an extra back bar to take the place of the 18in one it comes with. The 28in will accommodate up to 28in rollers. 

A Rolaframe Lap Stand comes with the items you see above.

1 Back Bar
2 Feet
1 Left Leg
1 Right Leg
2 Risers
1 Left Frame Rest
1 Right Frame Rest
8 10/24 x 1 1/4" Screws
4 10/24 x 1 1/2" Screws
12 10/24 Wingnuts
12 #10 Lock Washers
2 #10 Flat Washers