Description: Made of hardened carbon steel and precision ground Cross drilling design allows efficient use of lower weight with maximum strength 23 holes includes (5) 3/8-16 threaded holes for clamping and (18) untapped holes For clamping support, installation design and inspection work Easy to use, high quality, durable Specification: Precision:0.0002" Parallelism Color: Silver 3" Long x 2" Wide x 1" High Package Includes: 1 Pair of 123 Blocks .
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