1/4" Hand Foiler & 1/4" Copper Back Copper Foil Glastar Hand Foiler 1/4" - This product is a perfect tool for centering and applying the foil to the edge of a piece of glass. Specifically designed for 1/4" copper foil and 1/8"(3mm) thick glass. Venture 1/4" Copper Back Copper Foil - 1.0 mil Thick 1/4 IN X 36 YDS(4.76mm X 33 M)