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Fed. Spec. WW-H-171 Type 8 Riser Clamps | McMaster-Carr
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https://www.mcmaster.com/products/riser-clamps/military-specification~fed-spec-ww-h-171-type-8/
Fed. Spec. WW-H-171 Type 8 Riser Clamps | McMaster-Carr
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ANSI/MSS SP-58 Type 8 Riser Clamps | McMaster-Carr
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