Made to fit the Billet Box Rev 4 devices!
CNC machined out of T304 stainless steel [SS] and naval brass [NB].
In the first product image, from left to right: Busto+, Busto-, Pico+, Pico-
Busto+ : 12mm outside dia, 5mm inner bore, 12mm height
Busto- : 11mm outside dia, 5mm inner bore, 12mm height
Pico+ & Pico- : 8.8mm outside dia, 5mm inner bore, 12mm height