This is a Watch Protector Glass Guard. It's a protector that you thread onto the strap to protect the glass. It is currently out of production. It is deadstock. It is a large size. It fits up to approximately 22mm. The color is skeleton. It can be used on a wide range of watches, from divers to automatic and manual winding watches, and even regular watches. How about using it for everyday wear? It's lovely (*^^*) I am decluttering, so I am selling many items I collected in the past and watches with unconfirmed functionality!! Please be sure to check my profile before purchasing. This is a glass guard to prevent scratches on your watch glass. Please use it by threading it onto the strap. It is deadstock, but it is a product from several decades ago, so please understand. It is a large size. It's especially recommended for the upcoming summer (*^^*)