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. Ground circular blade is totally enclosed in plastic housing to ensure safety. The self-sharpening blade also cuts in either direction. Features an automatic see-through paper clamp and an adjustable backstop. Sturdy metal base has pre-printed grid lines. Can be wall mounted.