Clear Plastic Ruler 30cm 12" - Metal Cutting Edge - Craft Measure Sewing Tool Useful plastic ruler with a metal edge for cutting with blades and rotary cutters safely £4.50 Quantity: at £4.50 each Add To Basket 3 in stock. This is a superb quality clear plastic ruler - with a metal edge, perfect for use with cutting tools such as Stanley knives and Rotary Cutters. The ruler is 30cm / 12" long. Perfect for craft activities, sewing projects and to have around the home, office or study. We stock a range of other craft tools, materials and accessories.