The double honed replacement blade has a strong tip and flex so you do not have to worry about breaking their edge and tip. This versatile replacement blade fits with all standard light and medium duty Xacto style knives. Used with: cuts on paper, card-stock, stencils, film, photographs, tape, plastic, cork, wood, vinyl, cloth, leather, cardboard, foam boards and most other light-weight crafting. Fits with: K1, K3, K17, K18, K26, K30, & K71 handles