Our brass material pop up drain is available in Overflow or Non-Overflow options. Almost all glass sinks in the market utilize a Non-Overflow drain because there is no overflow hole built in unlike ceramic sinks.
One neat feature about this drain is when it's in the "open" position, you may twist (counter clockwise, to the left) the "pop up" head of the drain to remove it and clean any debris that could potentially clog the wastepipe. Simply thread it back clockwise to lock it in place when you're finished. Meanwhile, traditional drain assemblies that cost the same (if not more), require you to duck under the sink to perform maintenance work on the drain.
Lastly, the metal tailpipe is trimmable and can be cut to size to accommodate your P-Trap.