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.
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.
Review by Sarah
Great quality for the price, pairs good with alligator clips a bit harder to use with just wire
Sturdy and easy to work with
Review by Ellen
Stayed flat, easy to unscrew, easy for students to work with. Nice quality.
size of screw head
Review by Jacqueline
Helpful info in the description would be kind/size of the screw.
so much easier than alternatives
Review by Lyn
I ordered 50 of these for a co-op class of 24 students (2/student, plus a couple extra). It is a good thing that I ordered extra because three of them didn't work because the contact was too high, preventing the bulb from screwing into the holder. It was a hassle trying to attach the wires to the holder with 24 students because I only had two small Phillips screw drivers, but once the wires were attached, the holders worked great. I would definitely order them again because this was easier than the alternatives.