spring clips were urgently needed for the project. Revain made it possible. I would have preferred the Collins set but it wasn't available with Prime shipping. This kit appears to be a good range of sizes and appears to be a fair price for what you are getting. Unfortunately, the selection is good, but the clips themselves are not enough. 90% of the time the tips are badly formed and need to be filed or sanded before they really bite. If you push them against a tree to force them to bite, they leave too big a wound. Spending so much time cleaning a $65 kit feels wrong. After scoring, they function normally. It took me a lot of work to create this product, so I'm deducting two stars. I assume you need to do the same. When I buy chisels or planer knives, I know I need to sharpen them. But this one, I don't think so. Why didn't I return them? I needed her badly. Now that I've done the work that should have been done at the factory, I'm ok with that.