Macro Extension Tube 3 Ring Set Adapter for M42 42mm screw mount Camera Lens New Macro Extension Tube set for SLR cameras with M42 lens mount is composed of 3 extension tubes: 7mm, 14mm, and 28mm with male and female M42 screw mount adapters Mount the tubes between lens and camera body to get your choice of macro ranges - 8 combinations in total made of anodized aluminum Suitable for: SLR cameras with M42 lens mount; the modern Digital SLR cameras with M42 lens and M42 adapter for your camera body.