Handles! Each size is made to fit a different size/style of knife, but it is easy to customize to your preferences. The grain of wood and buffalo horn will vary from handle to handle. Most handles are wider at the base and taper toward the ferrule. Please refer to the following measurements for a more accurate fit estimate, but do note that individual handles may vary in size by 1-2mm. For more information or help with choosing a handle, contact us here. Photos are shown according to size (smallest to largest). 4.75" - (120mm) Best for Petty blades. Opening 11mm X 3mm Ferrule 21mm X 16mm Base 25mm X 21mm Weight ~26-30 grams 5.15" - (130mm) Best for Santoku, Bunka, Nakiri, or 180mm Gyuto blades. Opening 12mm X 4mm Ferrule 22mm X 18mm Base 27mm X 23mm Weight ~32-36 grams 5.25" - (133mm) Best for 180-210mm Gyuto blades, but can also work on bigger Santoku, Bunka, and Nakiri blades or for those who like a longer handle. Opening 13mm X 3mm Ferrule 22mm X 18mm Base 27mm X 22mm Weight ~30-37 grams 5.4" - (137mm) Best for 210-240mm Gyuto and most Sujihiki blades. Opening 13mm X 3mm Ferrule 23mm X 20mm Base 27mm X 24mm Weight ~38-42 grams Material Walnut / Buffalo Horn (ferrule) Shape D / right handed