Microcentrifuge Tube Holder, RPP We are manufacturer of Rack of Micro Centrifuge Tube, RPP. Features Sturdy rack with rubbed support at the bottom for stability Racks lock together on each side to allow user to attach several for larger experiments Compatible with both 1.5 ml and 2.0 ml Micro Centrifuge Tube Easy removal and insertion of tubes. Each hole has molded-in-numbers for easy sample identification Can be autoclaved.