ONE PC. KEY LESS TOP WIRE

What it means:

• ONE PC. = One piece (sold individually, not a kit)
• KEYLESS = No keyway or locking key mechanism required
• TOP WIRE = Designed for top-wire entry / top wiring connection style

In plain terms

This typically refers to a single electrical fitting or fixture component that:

• installs as a standalone piece,
• uses a keyless connection design (no special locking key needed), and
• allows wire entry from the top of the device or box.

Where you’ll usually see this wording

It commonly appears on:

• lampholder / socket listings
• box-mounted wiring devices
• simple electrical fixtures or adapters
• catalog line descriptions rather than stamped part numbers

Key takeaway

It’s not an ARL-style part number like the others you listed—it’s a generic product descriptor meaning:

“One individual, keyless-style, top-wire connection component.”