Promaster Macro Extension Tube Set for Canon RF

Extension tubes are a perfect solution to allow ultra close focusing
without sacrificing the optical properties of your lens. ProMaster Macro
Automatic Extension Tubes are engineered for a precise fit and proper
communications between your camera lens and body. 

The ProMaster 8826 Automatic Extension Tube Set for Canon EF mount includes three tubes (12mm, 20mm, 36mm) that
can be used individually or in combination to gain the right
magnification for your particular need.