A coupler for an excavator or other apparatus comprising a body for receiving an excavator attachment; a first latch member movable into and out of a latching state in which it is capable of retaining the attachment on the body. A score may be determined for an item or subset where standard deviations and distance metrics are computed to determine differentiators. The macro-embossing may comprise lines having a height of about 20 microns and a spacing of 80 microns, and the micro-embossing in the form of lines or dots to a height of about 2 to 5 microns.