ITEM NAME:Replacement Hinge Pin Tool for Bravo Sterndrive Units 91-78310 Part Number Description: This tool is designed to remove and install hinge pins for Mercruiser drive units. It is made of properly hardened tool steel, sturdy and durable. Hinge Pin Tool for Mercruiser Units Replaces 91-78310 It will withstand the torque required to remove the pins without slipping. This tool is used on the hinge pin bolt and separates the housing from the gimbal ring. Specification: Color: black Size: approx.5.0x1.5cm Package Includes: 1 Piece Hinge Pin.This tool is used on the hinge pin bolt and separates the housing from the gimbal ring. 1 Piece Hinge Pin. It is made of properly hardened tool steel, sturdy and durable. Color: black. Size: approx.5.0x1.5cm.