The CTA BMW Crankshaft Front Oil Seal Installer, No. 3881, is designed to replace front crankshaft seal on BMW B37, B47, B48, B57, B58, N47, and N57 engines. The set includes: 3881X01 – Press Sleeve, 3881X02 – Guide Tool, 3881X03 – Nut, and 3881X04 – Screws.