Ribbed insert for square tubes with flat top

Tube size (outside)

10X10, 12X12, 13X13, 15X15, 16X16, 18X18, 20X20, 22X22, 25X25, 28X28, 30X30, 32X32, 35X35, 38X38, 40X40, 45X45, 50X50, 52X52, 55X55, 60X60, 65X65, 70X70, 75X75, 80X80, 90X90, 110X110, 120X120

Tube size (outside)

15X15, 20X20

Tube size (outside)

25X25, 30X30, 35X35, 40X40

Tube size (outside)

40X40, 50X50, 60X60, 70X70, 80X80, 90X90, 100X100, 150X150

Tube size (outside)

20X20, 25X25