The stainless D rings made of stainless steel 316 commercial marine Grade, excellent for Indoor and Outdoor. Superior strength & rust resistance over grade 304, Galvanized and Cast Iron. Strong and durable. These D-rings are heavy duty and are welded which is important, that way when a dog decides to run after something it doesn't pull the d-ring apart.Strong enough for large dogs! The metal D rings are smooth with no burs or sharp points.Strong and sturdy,made of stainless steel 316,can be used for a long time. Dee rings used in a variety of applications including rigging, anchoring, boating, rope, chain, straps, webbing. Package included: 4 pieces stainless steel D-rings. JY-MARINE stainless D-rings for dog collars,clothing and harnesses projects.For sewing projects like making lanyards,Paracord key chains,jewelry,cosplay handbag,purses or leather work projects for your DIY needs.Also for the webbing,fabric craft,key leashes,apron straps,nursing covers,lanyards,etc.