# Tri — Power tool battery platform and accessory interface compatibility

For Tri, brand is Heller; compatible with is a 3-jaw drill chuck; notes is Cylindrical shank with same diameter as body with three recessed surfaces to prevent twisting, recorded from its source on 2026-08-11.

- **Item:** Tri _(verified: appears in the quote below)_
- **Brand:** Heller _(our reading, not quoted from the source)_
- **Compatible with:** a 3-jaw drill chuck _(verified: appears in the quote below)_
- **Notes:** Cylindrical shank with same diameter as body with three recessed surfaces to prevent twisting _(verified: appears in the quote below)_

## What the source says

> Tri Cylindrical shank with same diameter as body with three recessed surfaces to prevent twisting in a 3-jaw drill chuck

## Source

- https://www.hellertools.com/en/service/shanks

Last verified: 2026-08-11. Review by: 2027-08-11.
Part of [Power tool battery platform and accessory interface compatibility](https://referencesource.org/power-tool-battery-compatibility/).