Reliability: Proper placement of bow components helps maintain the reliability of the bow setup. Quality Materials: The T-square ruler is made of aluminum alloy, nocking pliers are constructed from stainless steel, and string nocking points are made of brass. Design Features: The T-square ruler features epoxy paint coating for scratch resistance and includes dual measurement scales in millimeters and inches. The nocking pliers have a spring-loaded design with smooth jaw operation for easy use. The set includes 8 nocking points with an anti-slip nylon inner layer to securely fix and protect the bowstring. Functionality: This kit is designed to measure bracket height and accurately position nocking points, supporting common configurations for bow and arrow tuning. Material: Metal Size: 12.9 x 3.46 inches and 2.63 x 1.1 inches / 2.67 x 1.4 inches Color: Blue Package Contents: 1 x T-shaped bow square 1 x nocking pliers 8 x bowstring nocks Note: The package includes only the items listed above. Other products are not included. Note: Lighting reflections and differences in display screens may cause slight variations in color representation. Measurement error allowance is +/- 1-3 cm.