Bradychan Stainless Steel Adapter/Metal Clasp Buckle Repair Tool Kit Screwdrivers for 42mm Apple Watch Sport Edition All Models (42mm) Stainless steel clasp for your watch straps of 38mm and 42mm Easy installation. Water resistant, lightweight and durable. This buckle is compatible with 38mm &42mm watches that have a modern or classic strap ( we also offer apple watch straps of 38mm & 42mm ) 2 sizes available: 38mm and 42mm.