This hexagon anvil has 15 holes and 5 milled slots for riveting, forming, and working small parts. It has polished faces and is made out of tool hardened steel. The holes measure from 6-0.5 mm in diameter. The slots measure from 1.2-1.6 mm in width, and are tapered down one side of the block. Overall measures 2.13 x 1.88 x 0.69"? (5.3 x 4.6 x 1.7 cm).