Alvin - Brass Wedge Sharpener - The Alvin Brass Wedge Sharpener is a wedge-shaped brass sharpener with a replaceable blade provides two cutter openings to accept 7/16 inch and 5/16 inch pencils. Alvin is one of the primary sources for drafting supplies and drawing equipment in the country. Creative Coldsnow is a pround retailer of Alvin graphic arts, drafting and fine arts products.