Bending handrails for curved staircases can be bent to a maximum radius of 48 inches. Any radius handrail tighter than a 4 foot radius can be made custom to your specifications. If your stair project requires a very tight railing bend, we will need to be provided with an accurate cardboard or plywood template in order to manufacture the section to properly fit your staircase. Please note that wood bending handrails only bend left and right, they do not bend up and down. In order to achieve up or down transitions, you will need to purchase handrail fittings (such as up easings and over easings) that match the appropriate handrail or bending handrail profile.