Caliper Jaw Attachment Holder from Fowler This unique device allows you to perform additional measuring functions with a pair of calipers. The Caliper Jaw Attachment Holder clamps on to the caliper jaw, allowing you to use a variety of contacts with this holder. This item only includes 1 Caliper Jaw Attachment Holder, but you can use 2 of these, 1 for each caliper jaw, with 2 of the same or even 2 different attachments for unique applications. Features include... Made of stainless steel Works with Caliper Jaw thickness of 0.135" Attachments sold separately.