Background: Transradial diagnostic coronary angiography becoming popular because its safety,shorter procedure time and few procedure compications. However, routine angiography using separate diagnostic catheter can easily induce severe radial artery spasm.Methods: We invented two new 4F diagnostic transradial catheter named RM and CR catheter for enging both left and right coronary arteries (LCA & RCA) only with one catheter. We tested these newer diagnostic catheters and conventional judkins catheter (JL) for 504 consecutive patients (pts) undergoing transradial coronary angiography. If we fail to engage at RCA, 035 wire was reinserted and assited the RCA engagement. We assessed the safety and success rate of RM and CR catheter and among the 3 different diagnostic catheters.Results: Out of total 504 pts, overall success rate of RM (95.1%) and CR (86.6%) catheter were excellent even without 035 wire assist compared with conventional JL catheter (63.7%), and RM & CR catheters achieved significantly higher success rate regardless of wire assist as compared with JL catheter. Overall success rate of RM was superior to CR catheters (Table). There were no major complications including intractable radial artery spasm, bleeding complications.Conclusion: Ther newer generation 4F RM and CR transradial diagnostic coronary angiography catheter achieved very high success rate for both LCA & RCA without any significant complications. The overall feature will be shown at the time of presentation.