4pcs Lime2018, Series or Parallel D Battery Holder:Used for Physics Laboratory,School Electronic Experimenting,Great for Demos Teaching Basic Principles of Electricity

This is great for home school making and breaking a single electrical connection circuit experiments. good for teaching basic principles of electricity & how a simple circuit works.these are great for demos and project. Easy to use and great learning tool for kids.I think practicing on an education model would definitely benefit any student. These durable individual plastic d-cell battery holders can be quickly and easily snapped together to form either parallel or series connections. They can be used individually or configured in parallel. screw type binding post,If you use alligator clips you might want to temporarily remove the connector knobs. This Battery Holde consists of baseboard, binding post. Battery Holde size:The base is 1 3/8" x 2 7/8" and when closed it is 1 1/8" high. Main Color: Black material: the use of high-quality copper and plastic. Net Weight: 38g Package Include: 4 x Battery Holder