This will fit the following Seiko Diver Models:
SKX007, SKX009, 011, A55, 7s26 and will fit any Seiko Diver with a 7s26 movement.

Thread Diameter 0.9mm / Length 14.8mm

Please note some SKX models do not have detachable stems, in this case you will need to purchase this additional stem to attach our jumbo crown as you won't be able to use your existing stem if the stem does not detach from original crown.