Flange bolts have a flange on the bottom of the head that distributes the load like a washer.
304
AIPERRO Slow Feeder Dog Bowls 304 Stainless Steel, 2 Cups Metal Food Bowls, Water Bowl for Small & Medium Sized Dogs, Fun Bloat Stop Pet Fast Eaters
[304 Food Grade Stainless Steel] High-end polished finish makes the dog bowls healthy, sturdy, durable, odorless, better stain-resistant, and rust-resistant performance, withstand years of use.