Mfg. # 300 The patented single load control knob and exclusive split-ball feature firmly locks the head into place. Holds all 300 series heads. This base has three 1/4" (6mm) countersunk mounting holes on a 4-5/16" (111mm) bolt circle for attaching directly to a work bench or to a portable Base Mount. Accepts all 5/8" (16mm) stems. Overall height is 3 3/4" (96mm).
74-397
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