The TonePros TP6A is a Nashville style Tune-o-matic Bridge made from aluminium with brass saddles and their trademark locking posts. Set screws in the bridge body lock it to the height adjustment bridge posts which improves vibration transfer, eliminates rattles and removes any chance of the bridge falling off during string changes or the height adjustment accidentally being changed. The action can be adjusted via the thumbwheels as normal but now TonePros has also included allen/hex wrench sockets in the top of the bridge posts to allow easier height adjustment from above the bridge when it's in position (please note the top of the bridge posts are the traditional Nashville 4 mm diameter, not the 5 mm diameter used on some Gibson USA guitars after 2012). The Tune-o-matic bridge features pre-notched saddles for quick installation.