BGS 7771 1 Thread Adaptor M20 x 1.5 mm for 7772

made of chrome molybdenum steel required when using the sliding hammer BGS 7772-2, 7772, 7776 in conjunction with e.g. hook BGS 7777-5, injector claws BGS 7777-1, 7777-2, 7777-3 inside thread M20x1.5 to external screw thread M18x1.5, Manufacturer: BGS