Cas-Ker Watchmaker and Jeweler Supplies Jeweler Supplies | Watchmaker Tools | Watch Parts | Watch Movements. Cas-Ker is the professional jewelers'' and watchmakers'' trusted source for precision tools and supplies. Our inventory may be the world''s largest selection of horological products including new and vintage watch parts, batteries, specialty tools, findings, watchbands, gift boxes, and more. Great service and low prices on brands like Bergeon, Horotec, Witschi, Horia, Elma, GemOro, L&R, Presidium, and Zenith. Find us at casker.com or jewelerssupplies.com. | Page 1 of 1