Crosshead (high-grade steel) with grub screw and thin nut as a check nut (high-grade steel). For the self making, DIY, of cross supports. Four possibilities:
KK 01515, for M6 and 2 mm cable, A 2 - Price
KK 08302, for M8 and 3 mm cable, A 2 - Price
KK 10302, for M10 and 3 mm cable, A 2 - Price
KK 12404, for M12 and 4 mm cable, A 4 - Price
The body isn't a fine cast part and under high loads thus not prone to brittle fracture. It is made of drawn steel rod machined in Germany.
"Made in Germany" (Saxony)