Toy Building Blocks &ndash; Bag of 12 Assorted Large Base Plates - Tight Fit and Compatible with Lego These Base Plates are compatible with LEGO blocks. Each Base Plate is a guaranteed a tight fit with the Blocks. Think of how many more Base Plates you can buy when you are spending less than a third (1/3rd) for them. These Buildings Blocks will give your child, and your husband, hours and hours of fun time together. Each order comes packaged in a mesh/net bag that you can use to wash your building blocks.