A frame bounding a hatch for the purpose of stiffening the edges of the opening and forming the support for the covers. In a steel ship it generally consists of a strake of strong vertical plating completely bounding the edges of a deck opening.
Ifreyimu ebopha isivalo ngesizathu sokuqinisa imiqukumbelo yokuvuleka nangokwenza inkxaso yezigqubuthelo.