INNOVATIVE VARIABLE BLADE TECHNOLOGY: H&Y Revoring step up rings give DSLR or Mirrorless camera system the ability to use one single filter on multiple lenses, also Revoring step up rings compatible with magnetic and srew-in lens filter of any brands TIME SAVING AND COST SAVING: Variable step up ring compatible with various lens sizes, making it easy to adapt to multiple lenses, reducing the cost of buying multiple filters and eliminating the need to change step up rings ROTATING GAPLESS SPRING THREAD, SPECIAL THREAD GROOVE DESIGN: H&Y variable filter step up ring effectively resolves issues with regular step up rings getting stuck on the lens or not matching with the lens thread HEAVY DUTY CONSTRUCTION ALUMINUM: H&Y filter uses heavy-duty aluminum materials, making filter adapter step up rings resistant to deformation and damage during use, ensuring long-lasting durability LIFETIME WARRANTY AND SALES SUPPORT: H&Y Filters ensures lifetime warranty and after-sales support. We value your suggestions on our products, which assist us in continuously improving and innovating for the future