SPRECHER & SCHUH D7-ALP Plastic, for SNAP-ON Contact Blocks and Power MODULES, Tool-Less MOUNTING Latch: Amazon.com: Industrial & Scientific
Amazon.com: SpriteGru Math Linking Cubes, Set of 100 Math Cubes Manipulative Connecting and Counting Snap Blocks for Early Math and Construction, Educational Toy for Preschool, Kindergarten, Homeschool : Office Products
Ken Block - Ken Block added a new photo.
Fisher-Price Colorful Blocks Toy W/ Hammer FP 1990 #2027 Ages 2 to 4 | eBay
Klippon® Connect SNAP IN Terminal Blocks - Weidmuller | Mouser