40-4004 is a 40mm x 40mm metric 40 series square T-slot profile with two opposite open T-slots, one on two 40mm faces. The profile is smooth, which makes it resistant to dirt and debris buildup while also being easy to clean. The 40-4004 profile is compatible with 40 series fasteners. The placement of the T-slots allows support structures or panels to be easily placed into them while maintaining a continuous surface, lending itself to projects such as guarding, furniture or displays