Sta-Kon D10711SP NON INSUL,No8,W/1/4BOLT,TUB RNG,SP

The D10711SP is built for 8 AWG conductor (wire size 8/8AN). It is a tubular ring tongue, so the barrel is a seamless tube rather than a rolled strip, and the conductor is stripped and inserted into the barrel before crimping. Running a smaller gauge in it leaves the strands loose in the barrel and gives you a poor crimp, so stay with 8 AWG.

No, it is a non-insulated terminal, bare copper with no nylon or vinyl sleeve. Where the installation needs a covered termination you will have to add heat shrink or tape over the barrel yourself, or specify an insulated ring terminal instead. Bare terminals are what most panel, motor and ground-bonding work calls for, since the lug lands under a bolted connection.

No. The D10711SP is a copper terminal and should be used on copper conductor only. Terminating aluminum wire calls for a lug rated AL or AL9CU with the right oxide-inhibiting compound; a plain copper barrel on aluminum is a corrosion and heating problem at the joint.

A ring tongue like this 1/4 inch bolt version is the one to use anywhere vibration or a safety-critical ground is involved, because the ring cannot slip off a loosened stud. Fork terminals are faster to service since you only back the nut off instead of removing it, which is why they show up on control panel terminal strips. For motor leads, bus connections and equipment grounds, go with the ring.

Yes, this is not a job for insulated-terminal pliers. A bare 8 AWG tubular barrel needs a non-insulated crimp die sized for 8 AWG, typically an indent or hex crimp from a ratcheting or hydraulic tool. The non-insulated dies are uncolored, unlike the red/blue/yellow nests used for insulated terminals, and using the wrong nest leaves an under-compressed barrel.

Country of origin on the D10711SP is Mexico. That matters on institutional and government jobs where the submittal package has to list origin for procurement review.