Used tremolo bridge. Comes with two extra locking nuts. 42 and 43mm I believe.

Light use, parted out from a guitar. works pretty well. $30. shipped. Located in the Northwestern United States region.
What color is it? (Black, chrome???)

And can you post a pic?

Jackson DK-2 [2004 MIJ] (EMG 81/SA)
Jackson RR-3 [2007 MIJ] (EMG 81/60)
Ibanez RG370DX [2009] (EMG 81/60)
Epiphone Les Paul Custom [2004] (EMG 81/85)
Ltd/Esp M-17 7-String [2013] (EMG 81-7 set)
Bugera 333XL 120watt Tube Head, Crate BV412 Cab