Why do some glass have indentions near the joint that doesn’t act as an ice catch Home › Frequently Asked Questions (FAQ) › Glass › Information › Why do some glass have indentions near the joint t.... Posted by Steve K on January 12, 2021 Well, these are not ice pinches. These are made so the joint can go on more easily. See the images below, and if that indent was not there, the joint could not go on cleanly.