Grounding Mid Clamps are used when top-mounting modules to the top slot of either our Standard (XRS) and/or our Light (XRL) Rails (fits both). Each Grounding Mid Clamp pierces through the anodized coatings of both the module frame and the mounting rail to form secure electrical bonds, which are repeated throughout the array. These clamps are not dependent upon the module's mounting holes. These Mid Clamps may be ordered with T-bolts. Mid Clamps require .25" between modules thus maximizing the total number of modules per set of rails. Available in clear or black finish.