21' Bench with Back The 9B2 Benches with Back are all-aluminum benches. The Benches with Back are available in three sizes (6’, 15’, 21’). The planks of the 9B2 Benches with Back are clear anodized, and are 10” wide. Listing Back To Top Design Visualizer Previous Next Design Visualizer CADdetails™ Downloads Product Info About Media CAD PDF DWF DWG Printable CAD VWX Specs Specs Download All Get In Touch Add to Project+ Favorite User Feedback