Reliability: Positioning the bow components correctly helps archers maintain consistent performance 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. Design Features: 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 string nocks with an anti-slip nylon lining to secure and protect the bowstring. Functionality: This kit allows for measuring bracket height, setting string nocking point positions, and supports standard configurations used in bow tuning. 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