Feature: 1. Bow Adjustment T Ruler: This T shaped ruler is a versatile design that can help adjust the bow span, facilitate archery locating, improve accuracy, and enhance the technical level of archers. It has compact size, light weight and strong applicability. 2. Bow Span Measurement: Bow span has a significant impact on archery speed and fault tolerance. If the bow span is too small or too large, it can cause increased vibration and have a negative impact on the performance of the bow. 3. Nocking Point Height Measurement: Clamp the T ruler on the bow string, place the long ruler on the archery table, and set the nocking point at the middle position of the short ruler gauge. Start wrapping the nocking point up and down by 1mm each. 4. Up Down Bow Distance Measurement: Clamp the T end of the ruler onto the root of the bow handle socket of the upper and lower limbs, measure the distance to the bowstring, and see what the difference between the upper and lower bow string is for better adjustment. 5. Stainless Steel: The bow adjustment ruler is made of excellent stainless steel material, rust resistance, erosion resistance, and no deformation. Double sided scale design, inch and cm, providing clear and accurate measurements. Specification: Item Type: T Shape Bow Square Material: Stainless Steel. Package List: 1 x T Shape Bow Square