The BU-11CPN is a heavy-duty copper grounding clip. Has a "+" stamped through the clip. Comes with wire lug for solder or crimp connection to wire up to 0 AWG.
The BU-11APS is a heavy-duty steel grounding clip. Has a "+" stamped through the clip. Comes with wire lug for solder or crimp connection to wire up to 0 AWG.
The BU-24APS is a steel grounding clip. Has a "+" stamped through the clip. Compatible with Mueller-brand BU-26 PVC insulators. Connects to wire up to 10 AWG via crimp or screw connection...
