Material :Aluminum alloy housing; Forged steel arm Cover:Full size plastic cover, slim line plastic cover Mount hole dimension:305 mm Door handed: Non-handed Valves: Adjustable latching and sweep speed value; Adjustable backcheck (BC) valve Power Options: Non-sized. Adjustable 1 thru 4 or 3 thru 6. Fixed size: 3, 4, 5 also available. Opening Angle: All standard arms applications allow doors to swing 180 degree conditions permitting. Arms & brackets: Standard tri-packed arm, Non-hold open. Optional: Hold open arm/Cush stop arm/ Cush stop hold open arm. Fasterners: Self tapping screws and machine screws standard. Sex bolts optional. Finishes: Aluminum (A), Black (B), Duro (D), Golden (G), Ivory (I), White (W), Sliver (S), Bronze (6). Other finishes are upon request.