Simple Folded Corners Ruler from Doug Leko of Antler Quilt Designs:

• Use for folded corners (12 different sizes) 1/2" to 6"
• Make accurate folded corners every time
• Use on oversized folded corner to trim down
• Use on no trim/exact size folded corners
• Instructions included (both right & left handed)
• No drawing lines
• 1/8" clear acrylic