Top: 1/2? wide is popular size in quilting? our quilting ruler design with a 1/2? ruler to measure or draw 1 1/2?--12 1/2" wide quickly. Left sie? Regular ruler max 12.5? Right Bottom side? Marked with dots??0? started from left? friendly with right-handed Marked with blocks??0? started from right?friendly with left-handed Try to resemble the angle you are going to be cutt. Take your strip and lay it diagonally on your cutting mat. Lay the ruler on top, aligning the 30 ,45, 60 angles cutting line. Cut through the slits as your width. Easy to Read: This 12.5 by 12.5 inch quilting ruler is made of high clear transparent acrylic,double color sight lines and large print numbers that show up on light and dark fabrics. High clear acrylic to see through the sewing ruler for a precise cutting. Ruler to Save Quilting Time: Square up blocks up to 12 inches;there is a cutting groove each 1/2 inch increments, just hold the rotary cutter perpendicular to the ruler along the groove and cut carefully, you don't need to remove while cutting,cutting several strips in one minute it reduce rotary cutting time so much Cutting ShapesIt is very convenient and fast to use the 45 degree and 60 degree angles to cut binding Stripes,squarestriangles, diamonds,trapezoids and parallelograms. Both Left-handed or right-handed people can use our 30/45/60 angles to cut. PackageRuler Dimension: 15inch*13inch, Comes with nonslip self adhesive silicone grips can help you avoid slippage of the ruler and template when using the rotary cutter, so that the cutting is safer and more accurate. Aftersales: If the products arrived broken,welcome to contact for a reasonable solution.