The Schaller roller bridges come as standard with posts with M5 threads that are too small for the kit (and a lot of other) post inserts, which have M8 threads. But Schaller do sell M8 posts for the bridge separately. I’ve got a roller bridge and the posts on order direct from Schaller to try out on my ES-3 to try and cure my bridge buzzing issues. It is about the lowest height bridge you can get, and it should end up as low as my modified Nashville if I’ve measured correctly, and I can sort out any string spacing issues at the same time. The gold plated version isn’t cheap though, almost as much as the kit cost, so it better solve my bridge problems!