Reliability: Properly positioning bow components helps maintain bow performance. Quality Materials: The T-square ruler is made of aluminum alloy. Nocking pliers are constructed from stainless steel. String nocking points are made of brass. Enhanced Design: The T-square ruler features an epoxy paint finish for scratch resistance and includes dual measurement scales in millimeters and inches. Nocking pliers have a spring-loaded design with smooth jaw operation for easy use. The 8 included nocking points feature an anti-slip nylon inner layer to securely hold and protect the bowstring. Wide Application: This kit is designed to measure bracket height and accurately position nocking points, suitable for common bow tuning setups. Specifications: Material: Metal Size: 12.9 x 3.46 inches, 2.63 x 1.1 inches, and 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: Colors may vary slightly due to lighting and screen settings. Measurement tolerance: ±1-3 cm.