宜家間射燈挺桿架

These mounts allow Tertial desk lamps to be mounted directly to the steel tube uprights on either side of an Ikea Jerker desk. These replace the mounts they come with that clamp to the desk surface. This clea up desk space and allows greater freedom of movement as the lamps aren't cotrained within the uprights.
They're designed to use a pair of M6 nuts and bolts, with the bolts being at least 45mm long and the nuts flanged (though not necessary).