Our 4 inch butt hinge are assembled from stainless steel screws, stainless steel ball bearings and stainless steel pins.If you are looking for corrosion-resistant hinges, stainless steel door hinges are a good choice.Suitable for stainless steel door hinges.We have 201 stainless steel and 304 stainless steel.304 stainless steel price is better than 201.Suitable for 304 stainless steel.It's hard to corrode.But it's also expensive.Customers can choose according to their own requirements.Stainless steel door hinges are sold in pairs.It is usually packed in one - on - one inner carton.Butt hinge is one of the most popular products in heavy duty hinge. https://www.kasna-hardware.com/f...e/4-inch-butt-hinge.html