With over 54 years of experience, Alvin is one of the primary sources for drafting supplies and drawing equipment in the country. Together with this core group of products, we continue to meet the needs our customers with our expanding range of fine art, hobby and craft supplies, our large selection of drawing room furniture, and our wide assortment of exclusively-designed products. XACTO-Craft Swivel Knife Replacement Blades. This package contains the replacement blades specifically for the Xacto Craft Swivel knife which was designed for easily cutting curves of all degrees into light-weight materials. This package contains three blades. Imported.