I bought these bridges for a fanned fret 5-string bass I'm building. I'm very impressed with the level of quality for the price. They have a uniform black coating, no ugly machining marks and no burred or sharp edges on the bridge or saddle.
It's a 3 piece design - the body screws to the guitar with two black screws provided and has a rear anchor point for top-loading strings or a hole between the screws for string-through. The saddle piece sits in a block that can be manually moved forwards and back for intonation (it helps if you loosen and lift the string). When intonation is correct, this saddle block is fixed in position with a tiny allen-head grub screw (all allen keys are provided). The saddle is fixed in its block with another grub screw facing the neck side. Loosening this allows the saddle to be raised or lowered with two more allen bolts. It's a good idea to scrape off some of the coating underneath to achieve a good earth.
If you really need top quality, Thomann sell the Hipshot single bridges, but this is a good, affordable alternative for those on a budget.