Rocker Arm Remover Installer & Valve Spring Compressor Tool for Chrysler, Dodge, Jeep 3.7 & 4.7L Replace OE# 3747-123 10102 8426 8387 8516A This tool is compatible with Dodge, Jeep, and Chrysler 3.7 and 4.7 liter engines from 1999 to 2013. Functions similarly to 10102 and performs the tasks of 8426, 8387, and 8516A. Compatible with Dodge 3.7 and 4.7L engines. Material: High-quality CNC machined heavy-duty steel, black anodized, durable, anti-corrosion, anti-rust, high precision, high hardness, and extended service life. This specialized tool enables safe removal and installation of rocker arms without damaging the camshaft or camshaft lobes. Designed for use in removing the camshaft, rocker arms, and hydraulic lash adjusters on 4.7L engines. The valve spring tool provides access to the valve retainer for removal using a magnet. Weight: 0.28kg Size: 10*10*4CM