Product Review

*SMALL------mostly be used for STEEL frame sofa: this is small size. fit for connecting 2 square tubes size 15*15 mm, or 2 round tubes Dia 15 mm. ( tube width: about 1.741 inches)
*MEDIUM 2.13 inches------mostly be used for ALUMINIUM frame sofa: this is middle size. fit for connecting 2 square tube size 20*20 mm, or 2 round tubes Dia 20 mm. ( tube width: about 2.135 inches)
*LARGE------NOT be used mostly. used for ALUMINIUM frame sofa: this is big size. fit for connecting 2 square tube size 25*25 mm, or 2 round tubes Dia 25 mm ( tube width: about 2.628 inches)

Important Notes:

-There are 3 size for your choose
-Please refer to detailed dimensions in picture before purchase.