Wheel Spacer | Die Cast Aluminum 5 Lug [108mm/4.25 to 135mm/5.00 BC] - 8mm or 5/16" Thick Coyote Wheel Accessories wheel spacers are die cast. Die casting is the metallurgical process of pouring molten metal into a mold cavity that has been created to replicate the desired part. After the molten aluminum solidifies, the part is removed for additional processes to prepare the part for use in its intended application. - Perfect for minor clearance issues with tires rubbing on shocks or struts. - Easy installation - Be sure to re-torque your lugs after 50 miles.