Klemmi's Knowledge
A short guide to what you should know about interlocking bricks.
What are interlocking bricks?
Plastic bricks with studs on top and tubes underneath that stick together by friction. Many manufacturers make them, and most follow the 8 mm stud grid.
The stud grid
The distance from stud to stud decides whether bricks fit. The standard is 8 mm. Large-grid bricks with 16 mm are meant for small children and do not fit standard bricks.
Do brands fit together?
Often yes, but not always. Clamp force and size tolerance differ. Try brands with a few bricks before you mix a whole set.
The difficulty level
We calculate it from piece count and minimum age: the more pieces, the higher the level. From age 14 it counts one level more, for toddler sets one less. The manufacturer can set its own value.
Edition size and end of sale
Only a few manufacturers say how many sets were built. We label every number as official, estimated or unknown.
Building instructions
We do not host instructions, we link to the manufacturer's page. That keeps them current and the rights with the manufacturer.
Where does the data come from?
From manufacturer data, from Rebrickable (CSV download, with attribution) and from community corrections. Every entry names its source.