Dimensioned Mini Square Cuts Layout Time In Half Our Dimensioned Mini Square has markings on both the outside and inside edges so that measuring and marking is quick, easy and accurate. And it's made of stainless steel, so it also works as a cutting guide for your knife. Especially handy for measuring and cutting scale model window openings and glazing. 3 inches x 4 inches overall with acid-etched 1/32 inch increments for a lifetime of use.