This is the cover for a "glove-box" sized hatch

Kajak-Sport original hatch cover series is made of real rubber. 100 % watertight hatch cover solution is created for the most demanding “expedition” use, when the cover is used in aberrant conditions and when the maximum reliability is essential. The cover is equipped with both inside and outside leash holders. Its material is extremely durable and long-lived. It is also fully UV-protected. 

These covers are recommended to be used with KS-hatch rim.

This is a small 'glovebox' sized hatch - for a 10cm hatch (for 10" hatch covers see KS Round 24 Hatch covers)

Dimensions:

Fits Rim: 11.3cm diameter (measured to outer edge of rim)
(The 10 refers to the size of the opening in the KS rim in cm)

Kayak Models:

Glovebox of Zegul sea kayaks, Mirage Sea Kayaks & new Nadgee Sea Kayaks and various others

Tip:
It is recommended to add silicon or similar lubricant to the inner edge of the hatch cover, especially in the initial phase to help the use of the cover.