Attachment of rails is based on the mounting application, such as a range hood with inside access or front mounting. Inside access hood mounting requires a stainless steel mount with a recommended 10-32 x 1" long stainless steel screw with a lock washer and stainless steel nut. An optional #10 stainless steel sheet metal screw is also provided as an alternative for front mounting. All necessary hardware is provided with each rail post.