JQK screws are well made all stainless steel slightly magnetic as they are 304 stainless steel As I use them around fresh water they should be fine. My only concern is that I mount them vertically (top and bottom of the doors and there is no latch stopper to hold them open. To solve this I need to drill additional holes in the mounting plates and install screws to as serve latches.Only buy this product if you install it horizontally!
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