Tree Grates: Corona The simple sunburst pattern of our Corona Tree Grate is a traditional motif that radiates timeless style. Offering heel-proof protection with 1/4″ slotted openings. Listings CAD Files Specifications Description Available Types RFQ & Share CAD 3D Specs About Media Education PrintCAD Share 1. Corona: 4' x 4' Heel Proof Has CAD Has Specification Has About Has Media Has Education Has PrintCAD Share 2. Corona: 4' x 6' Heel Proof Has CAD Has Specification Has About Has Media Has Education Has PrintCAD Share All Available 2D CAD Files Back to top Corona: 4' x 4' Heel Proof Download DWG Corona: 4' x 6' Heel Proof Download DWG All Available Specifications Back to top Corona: 4' x 4' Heel Proof Download Spec Corona: 4' x 6' Heel Proof Download Spec Company Resources Back to top Videos Informational Videos Photos Gallery Inspiration Blog Brochures ABT, ACO & MEA Brochure Curb Inlet / Bioswale Sys… Modular Planter Box Syste… NDS Brochure Product Brochure Support Documents Tree Grate Specification Trench Grate Specificatio…