PROTON | Finish SILVER W/ MIRROR FACE | size desc 18X8.5 | lug count 5.0 | bolt pattern metric 5X120 | bolt pattern standard 5X120 | offset 30 | backspacing 5.93 | centerbore 64.15 | load rating metric 907.0 | load rating standard 2000.0 | division 10 | barrel config S | shipping weight 28.31 | box label desc SLV MIR-FC | finish warranty ONE YEAR | structural warranty LIFETIME | rivet part no NONE | lip depth 0.0 | construction type Flow Formed Aluminum | bolt pattern mm1306 120