Hydraulic thumb clamps are an important and indispensable tool in modern construction by providing strong clamping force, precise control and flexible operation, which greatly improves the working efficiency and applicability of excavators. Material? Manganese Steel Specification: Hole Diameter 0.98in, Center Wheelbase 3.54in, Equipped with 2 pieces M14*15mm(0.59 inch) threads hydraulic oil hoses" Important reminder:Before purchasing, please ensure that your excavator's bucket mounting system matches the specifications listed above to guarantee proper fitting and functionality.