# XYZ Probing... Can we change the default bit size from 6.35mm **URL:** \ **Category:** Uncategorized\ **Created:** [July 12, 2021, 4:26am UTC](https://forum.onefinitycnc.com/t/xyz-probing-can-we-change-the-default-bit-size-from-6-35mm/6657 "2021-07-12T04:26:22Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![buggman](https://avatars.discourse-cdn.com/v4/letter/b/c37758/32.png) [@buggman](https://forum.onefinitycnc.com/u/buggman)\ **Post date:** [July 12, 2021, 4:26am UTC](https://forum.onefinitycnc.com/t/xyz-probing-can-we-change-the-default-bit-size-from-6-35mm/6657/1 "2021-07-12T04:26:22Z")
Just wondering if there’s a setting somewhere I’ve missed that will allow me to change the default 6.35mm diameter of the bit when zeroing to 3.157mm without having to make the change every time I zero…I’ve been mainly using 1/8" shank bits. I don’t mind changing from 3.175mm back to 6.35mm on the rare occasion I use a 1/4" bit. Thanks for any help ---
**Author:** ![pootaholic](https://avatars.discourse-cdn.com/v4/letter/p/8e7dd6/32.png) [@pootaholic](https://forum.onefinitycnc.com/u/pootaholic)\ **Post date:** [July 12, 2021, 6:24am UTC](https://forum.onefinitycnc.com/t/xyz-probing-can-we-change-the-default-bit-size-from-6-35mm/6657/2 "2021-07-12T06:24:48Z")
Change the default units in the controller to ‘Imperial’ measurements. ---
**Author:** ![WaywardWoodworker](https://avatars.discourse-cdn.com/v4/letter/w/e79b87/32.png) [@WaywardWoodworker](https://forum.onefinitycnc.com/u/WaywardWoodworker)\ **Post date:** [July 12, 2021, 2:38pm UTC](https://forum.onefinitycnc.com/t/xyz-probing-can-we-change-the-default-bit-size-from-6-35mm/6657/3 "2021-07-12T14:38:51Z")
You can change it in the settings menu: ![image](https://us1.discourse-cdn.com/flex022/uploads/onefinitycnc/original/2X/7/7626c6fd4a4130613ced79ad9e2be0527390a94d.png)