Lapmaster 12-inch, 24-inch & 36-inch High-precision Lapping Machines. Instruction Manual with an Electrical Schematic. The pack also includes a copy of the maker's very useful General Guide to Using Lapping Machines; five separate Instruction Sheets on How to Use the Lapmaster Flatness Control Chart (with drawings) and two copies of the maker's All-models Sales, Technical Specification and Accessories Catalogues - one from the original American manufacturer and another from the licenced British maker.