The product is excellent and a good price. I had to give it four stars out of five because two of the most iimportant bolts are so short that their threads do not engage the nylon ring in the nylock nuts. These are the vertical bolts around which the sliding pulley assembly moves. It seems to me that the brackets through which the bolts pass were welded to the slide in slightly the wrong position. When the bolts are run through, they are too short. A few more mm would be enough to engage the nylon ring. I will fix with loctite. But overall, the product, shipping and price are great.