These were a absolute pain in the a$$ to find out what would work with the Seiko 18mm clasp. But we have them now. These do also work on a variety of other watch brands.
The bars are 18-20mm x 1.50mm x .08mm ends. They currently are in 304L stainless steel. These are sold in singles.
They will fit, Seiko, Rolex, Sinn, Damasko, Citizen, MKII, Luminox, Omega, Tudor, Breitling, Bulova, Hamilton, Lum-Tec, etc.
SHIPPING: US shipping, is free with orders over $20.