[Fitment]: Steel Semi Wheel Adapters Big Wheels Conversion Compatible With 99-02 F-250 F-350 SRW,03-04 F-350 Dually,05-23 F-250 & F-350 SRW Bolt 8x170mm to 10x285.75mm [Wheel Adapter Function]:These adapters are designed to convert your bolt pattern from 8 Lug to 10 Lug(19.5 Wheel To A 10 Lug Semi Wheel).Giving you the option to use 22.5 or 24.5 SEMI Wheels, Compatible with 2x4 and 4x4 trucks.This Wheel adapters can also increase tire to frame clearance to allow installation of lift kits and or wider/larger wheel set up. Material:Made from High Quality Raw Steel,Very sturdy and light.Steel wheels can offer more resistance to impact cracks.They can also be more resistant to damage from deicers,gravel and brake dust,making them more popular for winter driving.The surface has been giving a coating that will protect the surface against corrosion. [Feature]:Safest Way To Use Wheel Adapters On Your Vehicles,Hub Centric Wheel Adapters are the best adapters to use.Your wheels will sit on the hub lip,not on the studs like other regular adapters. This will prevent any vibration from occurring.Wheel adapters widen your vehicle wheel base, increasing stability and resistance to side roll-over. [Intallation]:Make Sure You Get 5-7 Turns Before Tightening,Confirm the back of the adapter sit flush against the vehicles hub,You will then use the extra lug nuts to mount you wheels on to the adapters.Please Make Sure You Take The Proper Measurements Before Purchasing.3 Years Warranty against any functional defects. INSTALLATIONL: Professional Installation Recommended We recommend getting these adapters installed by a trained professional, but it is not necessary. Make Sure You Get 5-7 Turns Before Tightening Must be torqued down to factory specs. No Gap In Between The Adapter And Hub The back of the adapter must sit flush against the vehicles hub. Full Set Of Lug Nuts Included To Mount The Adapters You will then use the extra lug nuts to mount you wheels on to the adapters. Please make sure your torque them down to factory specifications. Vehicles Studs Cannot Pass The Face of The Adapter If the studs do pass the face of the adapter, you will need to grind/cut them shorter. (This only applies to 1.5" adapters & smaller). Please Make Sure You Take The Proper Measurements Before Purchasing If you are not sure, you can always email us and we will point you out to the right direction. We will be more than happy to help and get your order correct the 1st time. No Returns or Exchanges Once They Have Been Installed