Solid blocks with holes bored clear through are very useful for drilling, punching, pressing, riveting, shaping, bending etc.
NWSL Aligners are available in 3 sizes 3/32" (2.4 mm), 3.0 mm and 1/8". The center holes provide a snug fit, while the offset are loose fit. Basically they are designed for truing gears during mounting, but can be put to general use.
Jewelers bench anvils or blocks with 15 graduated holes, bending slots and hex sides are must more versatile. Since they can also be stood on edge, they are very useful as small anvils for riveting and shaping. Once drilled out, rivet heads can be placed in appropriate holes and punched free, without distorting riveted pieces
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