R-20J , Diagnostic X-Ray Beam-Limiting Device. || In combination with any of below X-Ray tubes: || 06/1.2P364DK-85, 0.6/1.2P324DK-125, || 06/1.2P324DK-85, 0.6/1.2P38DE-85. || Product Usage: || The device is the beam-limiting device for X-ray Radiography.