Rolling Grille Doors Available Options Curtain Choices Horizontal Steel Rods 5/16" diameter or 1/4" diameter Aluminum Links 2 1/4" length or 2" length   Bottom Bar 4" x 2" heavy duty extruded tubular aluminum or 3" x 3" heavy duty extruded "T" aluminum   Available Finishes     Aluminum Clear Anodized Please contact RDM for more available finish.           Locking Mechanisms Slide Locks (Standard) Center Lock Round Locks Ground Locks         Operation Manual Push Up (Standard up to 84 sq. ft.) Crank Chain Hoist (Standard above 84 sq. ft.) Motor Operator