Sturdy construction, this block holds my angle grinder securely. Easily adjusted to get a square cut and still hold the setting. I'm impressed that someone was able to design a holder that would probably fit most angle grinders and still be strong and accurate, especially for less than $25! Although the instructions could be a bit clearer, if you can't figure out how to put this together I'd suggest that you reconsider whether you really should be using an angle grinder!