These holders are designed to hold your Saleae logic analyzer. There is a 3mm mounting hole that allows you to attach the analyzer to something. We are using the holder to hold our Saleae logic analyzer against OpenBeam, which is used as part of the PCBGRIP system. When used with the PCBGRIP system, both sides of the board can be probed simultaneously. In addition, the analyzer is held in a fixed position relative to the PCB, which prevents the test leads from being easily pulled from the PCB. STL files for the Logic 4, Logic 8 & 8 Pro, and Logic 16 Pro are available. The Logic 8 & 8 Pro (both of which are the same size) holder has been printed and tested. The holders for the Logic 4 and Logic 16 Pro have been designed based on available dimensions obtained. If there are any problems with these two models, let us know and will make the necessary revisions. Additional images of this holder in action can be found here: http://pcbgrip.com/blogs/blog