Made of solid steel and powder-coated with a long-lasting yellow finish for easy spotting, these JPR Receivers are designed to go into the top of an A600 or A700 Series Aircraft Jack's Inner Slide Tube, an AT-EBnnn Extension Bar, or the AT500-CA Conversion Adapter (for A500 Series Jacks). The AT-JPR1 is a 1.5" x .187" (38x5mm) pad with a .875" (22mm) round Jacking Point receiving socket.