Valley Canoe Products brand oval hatch cover fits British sea kayaks, Necky brand kayaks, some older Wilderness Systems and other assorted sea kayaks, outfitted with a hatch rim 17.25 x 10 inches O.D. Best used as as a replacement hatch cover. Made of rubber and fits over the raised hatch opening like a Tupperware lid. Cover is 18.75 x 11.25 inches outside dimensions, 16.5 x 9.5 inside dimensions. Made by Valley Canoe Products, of Nottingham England, for Necky Kayaks with the Necky logo on it. Fits all VCP oval hatch rims, on any brand of sea kayak.