I have 39 pieces of glass which may be useful as shelves for insulators. This glass is NOT tempered so do your own calculations. Support at just the ends might not give enough capacity. The pieces are 4 inches wide by 5.5mm thick (not sure what this translates to in inches but a 5.5mm wrench fits almost perfectly). 21 of them are 21 inches long, 18 of them are 25 inches long. Length is not exact but all are very close to stated dimensions. A few are chipped, one is missing a corner. These are available for free but postage is up to you. Free pickup in Plymouth, MA is another option. If postage is needed I will build a wood crate (no charge) for them but there can be no insurance from the P.O. as they are free. If they are too heavy for USPS, I'm sure we can agree on another carrier. Please don't have me build a crate and then balk at the shipping cost, everyone knows glass is heavy. Please contact me at NH4142@webtv.net and do be aware that I don't get anything done quickly.