Below are the available bulk discount rates for each individual item when you purchase a certain amount
The patented single load control knob and exclusive split-ball feature firmly lock 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). #300.