Reliability: Positioning the bow components correctly helps archers maintain consistent performance of the bow. Quality Materials: The T-square ruler is made of aluminum alloy, the nocking pliers are constructed from stainless steel, and the string nocking points are made of brass. Enhanced Design: The T-square ruler features an epoxy-coated surface 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 ease of use. The set includes 8 nocking points with an anti-slip nylon lining to securely hold and protect the bowstring. Wide Application: This kit is designed to measure bracket height, set string nocking point positions, and support standard bow tuning configurations. Specifications: Material: Metal Size: 12.9 x 3.46 Inch; 2.63 x 1.1 Inch / 2.67 x 1.4 Inch Color: Black Package Contents: 1 x T-shaped bow square 1 x Nocking pliers 8 x Bowstring nocks