Hudson Cores Foundry 14 South St Roehr Tool Corporation is a leading manufacturer of Expandable cavities and collapsible cores. Mold makers, molding components, cores, cavities, Tools are designed for circular parts requiring either internal or external undercuts such as threads, dimples, grooves and protrusions. Hudson MA Cores Foundry Roehr Tool Corp www.roehrtool.com mold design mold components collapsible cores expandable cavities mini cores caps closures tools plastic O rings cores cavities luer unscrewing barbs tools slides n threads roehr plastic barbs. mold design mold components collapsible cores expandable cavities mini cores caps closures tools plastic O rings cores cavities luer unscrewing barbs tools slides n threads roehr plastic barbs. Business Reviews Roehr Tool Corp Testimonials