This is a Freedom Stratocaster bridge. It fits the 10.8mm pitch common on Japanese-made Stratocasters. I bought it for an 80s Tokai ST-60 and used it for a short while. It was a direct fit for the ST-60. It's a solid steel block, but I thought it would be more interesting to use the original bridge on the Tokai, so I removed it. It hasn't been used much. It sells for 16,800 yen at Sound House. Freedom Custom Guitar Research SP-ST-06NI Synchronized Tremolo Unit Nickel 10.8 S188NI Synchronized Tremolo Unit Nickel A tremolo unit that combines vintage sound and excellent functionality To reproduce the wonderful tone of vintage tremolo units, F.C.G.R. focused on the "inertia block" and "tension" in this product. For this purpose, they adopted a "chamfered & unpainted" steel inertia block and made the string ball-end storage area shallower. This brings the way the strings vibrate closer to vintage, producing a sound with rich sustain and expressiveness, including beautiful overtones. Furthermore, they aimed to "make the strings less likely to break" and "make it easier to adjust octave tuning." To achieve this, the edges of the base plate holes that come into contact with the strings are tapered. In addition, by widening the range of movement of the saddles on the underside of the base plate, it is possible to properly adjust the octave even when using thick gauge strings. ●Synchronized Tremolo Unit 10.8 has two types of bridge saddles: S188...Flat type, with no groove in the center of the saddle to rest the string ●Hex wrench size for set screws used to adjust the height of the bridge saddle: 1.5mm ●The tremolo arm standard is metric. Product contents: Bridge body / Spring hanger x 1 / Tremolo arm x 1 / Hanger mount screws x 2 / Mount screws x 6 / Tremolo springs x 5 / Wrench x 1