How large are the compartment openings? Do you sell the extenders?
Hi, each compartment is 3-5/16" in diameter. We do not sell the extenders by themselves for this glass rack. This particular glass rack does include 5 extenders and has an 11" height. If you need additional information on extenders, you may want to contact the manufacturer at 1-800-628-0830 or firstname.lastname@example.org. Thank you.