Alvin 7355 Screw Data Selector in Slide Chart Design 5 x 10 Inches

Slide chart design for determining sizes of various screws, threads, drills, holes, etc. Size: 5 x 10 inches. Alvin has been the professional's choice for drafting tools and drawing supplies for over half a century. Since 1950, we have brought quality and value to our customers. Our tools help bridge the gap between ideas and innovations. We are known for our wide selection of high quality tools at a fair price.