The ER20 collets are suitable for use in our wide, and X-Wide bodies only.

please select your desired size from the drop-down list above

Size ranges for ER 20 collets are as follows:

8-9mm  | .315-.354 | used for .338

3/8 | .336-.375 | used for .375 cal

9-10mm | 3547-.3937 | used for .375

10-11mm | .394-.433 | used for .416

11-12mm | .433-.472 | used for .460

12-13mm | .472-.512 | used for .50 BMG