Sheet Metal Screw, Self-Tap Pan Head Phil Driv #10 X 2in 18-8 Stainless Steel 100PK The threads on sheet metal screws are designed to pull two materials tightly together.
Fender Washer, Fits Bolt Size 5/8" ,Neoprene Black Finish, 5 PK This allows it to be used on softer metals.. They are most often used in the automotive and other sheet metal industries.