Feature 1, Compatible for any 6 hole hub adapters with a 70mm bolt pattern 2, Precise design, wear resistance and anti-rust 3, Made with high strength Aluminum alloy for maximum durability 4, These bosses kit are double drilled so work for Nardi/Personal/ Momo/Sparco/OMP steering wheels 5, Especially designed for 3 Series E30 1983‑1991(does not fit for 318i 1989 and 325i 1991)Feature: Made with high strength Aluminum alloy for maximum durability. Original standard, direct replacement for old or broken one. Fast detach allows steering wheel to be removed quickly. Precise design, wear resistance and anti-rust. Compatible for any 6 hole hub adapters with a 70mm bolt pattern. These bosses kit are double drilled so work for Nardi/Personal/ Momo/Sparco/OMP steering wheels. Especially designed for 3 Series E30 1983-1991( Not fit for 318i 1989 and 325i 1991). Specification: Condition: Brand New Material: Aluminum alloy Color: Silver Size: As Picture Show Steering Shaft Diameter: Approx 17mm/0.7in Package Weight: Approx 900g Fitment: For 3 Series E30 1983-1991( Not fit for 318i 1989 and 325i 1991)Number of Teeth: 54 Package List: 1 * Steering Wheel Adapter 1 * set Accessories Note: 1. Please allow 1-3cm error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.