These are basic bulb holders, but they are a great value for the money. They are lightweight, however, and depending on how you intend to use them, you might want to screw then down to small blocks of wood. (There are mounting holes for this.) This might save a little wear and tear on the bulbs you use with them. Overall, a very good price for a simple teaching tool.
Great quality for the price, pairs good with alligator clips a bit harder to use with just wire
Sturdy and easy to work with
Stayed flat, easy to unscrew, easy for students to work with. Nice quality.
Plastic base with screw terminals. Designed to fit all our screw base light bulbs. 19mm high, plastic holder has diameter of 30mm, attachment holes for wire are 2cm apart. Product photo is enlarged to show detail.