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This is an additional punch tube size for the Sailrite® Rotary Hole Punches (#123274 & #123273). The Sailrite Rotary Hole Punches do not include a 1/16" (1.5mm) punch tube; this is an add-on that must be purchased separately.
To install: Insert a 2.5mm or smaller hex key into the hole at the base of the punch tube to loosen and unscrew the tube and install the replacement.
I have the Crafttool punch and their 1/16 tube wasn't sharp and didn't the blunderbuss at the end when tub jammed. Your tool is much better. I punch up to 300 holes a day in various sized about 60 with the 1/16 tube. you are more pricey I only bought one to check quality. I would buy 4 more if they were a little less in price.