Two pair (4 pieces) of our high quality, 20mm stainless steel, OEM "fat spring bars." These are an absolute requirement for your Seiko Dive Watch. Standard spring bars are a much smaller diameter, anywhere from 1.5mm to 2.0mm. Our OEM fat spring bars are ~2.55mm in diameter. About 316L OEM Fat Spring Bars: Our fat spring bars are made of 316L stainless steel -- Rolex uses the same 316L stainless steel for their spring bars. That's good enough for us! Our fat spring bars are identical to the original Seiko fat spring bars. Note: The ends of the fat spring bars are 1.1mm in diameter. These will NOT fit all watches. You need to make sure the lugs on your watch will accommodate a pin size of 1.1mm. Measurements: Uncompressed Length: 23.8mm Barrel Diameter: 2.55mm Barrel Length: 18.61mm Shoulder Diameter: 1.71mm Pin Diameter: 1.1mm
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