Crain 112 8" Vinyl ScriberThis versatile 8 inch bar scriber works both as a wall scriber and a seam scriber. The tool has a rounded end guide for wall scribing, and a bottom guide for seam scribing that runs along the edge of the bottom piece of material as the top piece is being scribed. In addition, the red housing has a hole in its bottom for a second needle which allows the tool to scribe circles or feature strips. The 8 inch bar allows approximately a 6 inch length