Crain 111 6" Vinyl ScriberThis versatile 6 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. The 6 inch bar allows approximately 5 inch length adjustment using the large steel thumbscrew. Needle height is adjustable for various material thicknesses using a screw on the front of the