The engraver GG 12 spins at 20,000 rpm, yet weighs only 4 ounces! It allows for easy control and thus very safe operation featuring a touch sensitive switch for easy use and a simple push in/pull out shaft holder for easy accessory changeover (shaft capacity 3/32" (2,35 mm) only). The set includes: Engraver GG 12, AC adapter (12 - 18 V, 0.5 A), trial glass and four bits: two spherical head diamond grinding bits 1/32" (1,0 mm) and 5/64" (1,8 mm) for engraving and line work, two silicon carbide grinding bits (conical and bullet shape) for shading and frosting as well as 1 corundum grinding bit in ball and cylinder shape for grinding and engraving (all shanks 3/32"). The bits are also optimal for working on metal, stone, shell and other hard materials. Also included in the set is a bit holder for clean storage of rotating bits. This is a 110v tool.