OpenBeam precut kit black anodised holds a variety of lengths. OpenBeam is 15mmx15mm and hollow core. OpenBeam has no threaded ends. The lengths you will find in the precut kit are 300mm (2 packs), 270mm, 210mm, 150mm (2 packs), 120mm, 90mm (2 packs), 60mm (2 packs), 45mm, 30mm. The kit also contains MakerBeamXL right angle brackets (2 packs, 24 pieces) and T-brackets (2 packs, 24 pieces), vinyl end caps (2 packs, 8 pieces), hexagon head screws (1 bag), button head socket screws (1 bag), hex nut driver, hex key driver and nuts (1 bag) and is packed in multi usage storage box with compartments.