This wok ring with non- edge on both end is best useful for round bottom wok to use. Universal size for gas stove fry pans. For round bottom woks, wok ring should smaller than the desired wok diameter. Height: 1.57 Inches; Bottom Diameter: 11.8-Inch; Top Diameter: 10.43-Inch. Wok ring has a construction, perforated sides on a flat steady rim. Wok Rack can be use to support woks when cooking on a regular range. With this ring, narrow side down, heat wok on small fast electric burner. It is power-frugal, heat raises and drops quickly, and food as it would on gas burner. All coils are covered, so all energy is used. Ring fits outside coils ly. Flat-bottom wok sits close enough to absorb all heat. dissipates heat all over wok, so food does not burn. is small, so flat bottom and flat coils bump and limit wok movement colour:Silver material:stainless steel size:26.5x30x4cm Package Contents: 2x wok racks Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.