SHRINK FIT TOOL HOLDER

https://www.bright-tools.com/products/shrink-fit-tool-holders/

SHRINK FIT TOOL HOLDERS SERVICE LIFE
The Shrink Fit Tool Holder is a unique piece of equipment that requires the use of a heating machine for optimal performance. This tool holder is designed to expand when heated, allowing for the insertion of the tool, and then shrink back when cooled, creating a tight, secure fit.