"Single" Horizontal Round Rail Mount - 7/8" or 1"Extremely strong and features 2-way adjustment for perfect horizontal leveling. Made of 18-8 stainless steel and 356 anodized aluminum, it quickly detaches without tools for compact storage leaving no hardware on the rail.Fasteners for attaching this mount to Gourmet Series Grills are included with the grill.*Please Note: 7/8" or 1-1/8" plastic rail size adapters in the 300 series round rail mounts are not recommended for use with the A10-1225 "Monterey" or A10-1218 "Catalina" Gourmet Series Gas Grills. When using these models on 7/8" or 1-1/8" round rails, use "Dual" Horizontal Round Rail Mounts.