These make changing tires/wheels easier as the blocks don't change position or fall. There is only one lazer etched mark on the block to guage the distance from the tensioner but I still found it very easy to get the axle square in the swingarm. The threads were right for the swingarm and the construction was right on. I like the little bit of bling they provide. Not too flashy for a bike that gets ridden hard and often. I don't have any paddock queens and this part fits right in. Happy with the product.