Made of hardened steel with a smooth, polished surface, this tool was built for durability and reliability. A convenient tool for riveting, drilling, and staking small parts, this base can be used to form wire rivets. · Hardened steel base • Portable · Polished for long life • Versatile · Has 15 holes of different diameters • Economical · Has 5 milled slots - 3/64" to 1/4"(1.2mm to 6.4mm)