These are well made and fairly close to their nominal size making them easy to use. They are stainless steel but I don't know the exact alloy. They are very, very weakly magnetized and almost completely unresponsive to strong magnets. The steel is quite hard and doesn't scratch or scratch.
π© 5-Pack of M8x60mm Stainless Steel External Hex Expansion Bolts by Yasorn
10 Review
POWERTEC 4 Inch 20 2 Inch QTB1005 T Slot: A Revolutionary, High-Quality Power Tool Accessory!
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π© Hard-to-Find Quick Fastener 014973253790 - 4 Piece Set
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Highly π Sought-After Fastener: Connector 014973445713
9 Review