This is an aftermarket product imported from overseas. It's a set of six vintage-style steel press saddles for a Stratocaster. They have a slightly thin stamp like Fender Japan (or was it Mexico?), making them perfect for enjoying the atmosphere in a "faux" way. Note that Fender Japan, etc., have the stamps aligned in the opposite direction, but these are stamped in the same direction on both rows, just like the USA-made ones. Chrome-plated, the saddles are approximately 10.5mm wide, with M3 set screws approximately 10mm high. The saddle thickness is 1mm. An adjustment L-wrench is included as a bonus, but the precision isn't very good. If you use this type of bridge, you probably already have a wrench for the set screws, so please use that for fine adjustments.