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.
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.
most work well
Review by Lyn
I ordered 50 of these for a co-op class of 24 students (2/student plus two extra). All but three of them worked fine, but three would not allow the bulb to screw in as the contact inside was too high. Students need to have access to a small Phillips head screw driver to loosen and tighten the screws that hold the wire to the bulb holder. Because I only had two screwdrivers, it was a bit complicated when it came time to help students attach their wires, but once the wires were attached, the holders worked great.