Extension tube for indoor/outdoor use. Camera extension tube. For mounting on brackets. Application area: indoor/outdoor. Detail color: white. AXIS T91B52 extension tube 30 cm. Axis - a name you can trust. The world's first network camera was invented by Axis in 1996. The company continues to be a leader in the field of video surveillance. Axis Communications was founded in 1984, and the Swedish company now has its own offices around the globe. Axis network video products are also found everywhere: in public spaces, retail, airports, trains, and highways, in universities, in correctional facilities, in casinos, and in bank branches. The entire Axis value chain, from research and development to production and recycling, is characterized by the company's commitment to quality.