The Shimano SM-MA-F180S/P adapter allows the installation of Shimano IS2000-Standard caliper on forks with Postmount 160 mm direct style in conjunction with 180 mm rotors.
Product features - Shimano SM-MA-F180S/P

Fork type: Postmount 160mm (PM6)
Caliper type: IS2000-Standard
Rotor diameter: 180mm

Material

Adapter: Aluminium
Screws: Steel