Janser Green Box Hooked Blades RWS008A These are German made hooked blades of very high quality used by carpet fitters and floor layers. The hooked blades come in boxes of 100 and sub divided in to 20s in plastic dispenser which keep the hook blade safe while in the tool box. As with any blade the carpet fitters should take care when changing or using the very sharp blades. These blades fit the Janser coloured knives. They will also fit standard pattern knives including Dolphin knives and dolphin style knives.