The Professional Boxer - Stained Glass Tools/supplies An aid for squaring glass panels such as those in jewelry boxes during soldering assembly. Dimensions of all materials are 3/8" Thick. Lexan Clear. Base is 6" X 6" Square. The 2 Sides are 5 3/8" X 2 1/2 Finished Size is 6 3/8" X 6 3/8" by 2 1/2" High These are very high quality made by Ceator's Stained Glass Inc. IN THE U.S.A.