Cast Iron Ring Clamp with 5/16" diameter stem Open boss head fitted with thumb-screw to accept rods from 5/16" to 5/8" dia Extension distance from boss head to ring is approx. 1.5" Inside Diameter of ring 2.5" Clamp from Boss head center line measures 5" to edge of closed ring. Cast Iron Ring Clamp with 5/16" diameter
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