170 Points Mini Breadboard for Arduino Proto Shield 6 PCS and 6 Colors

Purchased for a "Take Your Kid to Work Day" project in R&D, then purchased again for the R&D group ;-)They measure not quire 1 1/2 in x 2 in and have a peek-n-stick adhesive back.No rails, but 2 mounting holes, and you can click multiple breadboards together.Nice, tight contacts for standard 0.1" (2.5 cm) spacingGood quality, very pleased