12-Piece Mountain Bike Disc Brake Rotor Bolt Kit - M5x10mm Stainless Steel T25 Torx Screws for MTB Bicycle Brake Disc - Durable & Corrosion-Resistant - Perfect for Trail Riding & Bike Maintenance (Black)

I live in Minnesota and use my bike through winter so resistance to rust for components that aren't commonly/routinely greased is very important. I purchased these because they are "Stainless Steel" (which is a family of grades of steel and arguably a marketing term) and I didn't feel the need to spend more for something that was titanium because I'm not crazy about keeping my weight low. Unfortunately these stick firmly to magnets so they are at best are a form of stainless steel that isn't rust/corrosion resistant enough for me.I'm rating these somewhat low because I believe the buyer expectation when selecting a "stainless steel" bolt for this application is to get the maximum realistic rust/corrosion resistance. If these bolts didn't include "stainless" in the name or if the exact alloy used was specified in the description I wouldn't be rating them negatively.