Heavy-duty aluminum channel pieces are the structural base for building blocks for creating  robots. Comes in five different lengths for flexible building – also, pieces can be cut to custom lengths with a metal-cutting blade，The hole distance is 8mm, the diameter of the large hole is 8.1mm and the diameter of the small hole is 3.8mm.compatible with TETRIX PRIME，                                                                                                                                                                 

Size: 32 mm x 32 mm x 32 mm

Quantity: pkg of 2

Weight: 13.2 grams per channel

Material: 7005 Aluminum.