Renew your diver watch with a new GS Diver-Tite OR Tru-Seal OR Stella Neptune double thick deep sea pressure proof with tension ring glossy clear round domed acrylic plastic crystal. Measure your crystal while removed from the watch with a caliper to assure fit. Choose the correct size from 28.0mm to 34.7mm. The dome height is 5.7mm. A correct tool may be required for installation. Mailed quickly in a bubble protected mailer USPS Ground Select for $4.50 to your USA address. No additional postage charge for multiples on same order.