Aluminum Diamond Plate | Tread Brite                                             3003 Aluminum Diamond Plate / Tread Brite has a bright highly reflective finish and is used for lightweight structural and cosmetic applications. It has a raised "diamond" pattern. 6061 Aluminum Diamond Plate / Tread Guard has a semi-reflective finish (not as bright and reflective as the 3003 alloy) and is used for heavier structural and cosmetic applications. It has a raised "diamond" pattern. It provides better strength than the 3003 alloy.