Combo Order - 640 Sliding Shelf w/ Left Drop In and 640 Foldable Top Shelf Please review all information below. Please contact us prior to ordering if your smoker build date is older than February 2015, as the shelf may require customization. The BBQ Slidin’ Shelf Kit w/ Drop In option for the Yoder YS640 includes the shelf, frame, spacers and an expanded metal drop in insert. There is 4“ of clearance between the top of the slide shelf and the bottom of the top shelf. Please watch our demo video and feel free to contact us with any questions. The kit is also available with a standard expanded metal shelf, part number SSK640. These will be built to order. This folding top shelf measures approx. 28"x15 3/4", replaces the top shelf in the ys640/640s and is available with expanded metal material or as 3/16" plasma cut mild steel. The 3/16" steel option retains heat differently so cook times may vary. The shelf is designed to fold in the middle to allow easier access to the bottom shelf and possibly avoid having to remove and store the shelf. Flat rate shipping is $55. Please allow 4-5 weeks for build time as shelves are built to order. Please note, as demonstrated in the video, the standard grill grates drop in going left-right vs front-back. This is by design to work without any cutting or modifications to the standard Yoder Grill Grates. When sliding the shelf out always be cautious of grease dripping or collecting. Disclaimer: Shelf should be washed with soap and water and properly burnt in and seasoned before use. Weight capacity of the sliding shelf is 60lbs and the foldable top shelf is 15lbs. Edges may be sharp and the shelf will be hot when in use so use caution. Height difference of the cooking surface of the sliding shelf is approximately 1 1/4”, so cook times may vary.