DuraGuard’s Contemporary Arms are Constructed From Aluminum Sand Castings. Castings are Welded and Heat Treated, After Weld, to a T6 Hardness for Maximum Strength. These Products Include Factory Installed Rubber Grommets for Wireways, Press-On End Caps and Set Screw Shaft Mounting connections for Easy Orientation Adjustment in the Field. Super Durable Polyester Powder Coat Finish. Custom Finishes Available, Including Patinas and All RAL Colors.