For 35$ you'd expect this tiny piece of metal to be flawless. But it is far from that.
The contact (arguably the most important) surface of the piece is not machined very well. It makes the action of the knife very gritty and unpleasant. You can see lines from machining on the contact surface. When it wears in a bit (that takes a long time) it gets better, but is still gritty.

You can get a set of 3 basic steel replacement lock bars from aliexpress, ebay, etc. for maybe 10 bucks and I bet they are better finished than this as well. Can't recommend this, it's a ripoff.