Reliability: Positioning the bow components correctly helps maintain the performance and reliability of the bow. Quality Materials: The T-square ruler is constructed from aluminum alloy. Nocking pliers are made of stainless steel. String nocking points are made of brass. Enhanced Design: The T-square ruler features epoxy paint coating for scratch resistance and includes dual measurement scales in millimeters and inches. The nocking pliers are equipped with a spring-loaded design and smooth jaw operation for ease of use. The 8 included nocking points feature an inner anti-slip nylon layer to securely fix and protect the bowstring. Versatile Use: This kit is designed to measure bracket height and accurately position nocking points, supporting common configurations for bow and arrow setup and tuning. Specifications: Material: Metal T-Square Size: 12.9 x 3.46 inches Pliers Size: 2.63 x 1.1 inches / 2.67 x 1.4 inches Color: Black Package Contents: 1 x T-shaped bow square, 1 x nocking pliers, 8 x bowstring nocks Note: Lighting and display differences may cause slight variations in color. Measurement accuracy may vary within ±1-3 cm.