This blade is an ice hockey knife, used for roller skates to remove the wheels and convert them into skates for skating (speed skates and three-wheeled roller skates cannot be used, others can be used)The blade is made of stainless steel with heat treatment process, strong and durable, equipped with aluminum alloy side plugs and other accessories, easy to installDescription: Can be combined with all kinds of flat shoes, casual shoes, childrens roller skates. (Speed skating shoes are not available) There is no need to replace the blade holder, just remove the wheels and install the ice skates directly. Simple and convenient, you can instantly turn your roller skates into ice skates, saving effort and space The small size 253mm is used for the modification of roller skatesSmall size blade: total length 253mm, can install most roller skates below 37 yards (support for roller skates below 231mm)type: Bcolour: silverMaterial: stainless steelPackage Contents:1 x Small code Roller skating accessoriesOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.