Healing abutments are temporarily placed on top of the implant during surgery to shape the gum to the correct emergence profile to aesthetically restore using a permanent crown and to avoid any additional surgical procedures on the implant. The shape of the healing abutment can be flared to achieve smooth emergence profile from implant to crown or parallel-sided for narrow diameter teeth.

Note: Healing Abutments with profile diameters 4.5mm and 6.0mm require purchase of 0.050" Hex Screw Driver. 

 Note: Healing Abutment with profile diameter 5.0mm require purchase of 0.048" Hex Screw Driver.

 https://titanimplants.com/0-048-1-2mm-hex-screw-driver/

Sizing help: How to choose healing abutment profile diameter and collar height.