I have heard they are steel so they should be good. Not a bad price for a steel mount. Darrell's is Aluminum but supposed to be real high grade alloy. "heavy duty, but still light, because they are machined from solid High-Strength Aircraft Aluminum Alloy Barstock. Stronger than standard steel, but only ~1/3 the weight." I think Steel would still be stronger but I ordered Darrells mount as it has a good reputation. I have heard nothing bad about the S&K mounts so they should be good. Jim