Specs & Features Material: Aluminum / Bolt (SCM435 chromoly steel) Bolt Pattern: 5x114.3 or 5x100  Thickness: 11mm / 15mm / 20mm / 25mm / 30mm Hub Diameter: 56mm x 66mm Thread size: M12 x P1.5 Quantity: 2 pieces 1 set JWL Certified for highway use Upgraded to a wide tread by bolt-on mounting on genuine and commercially available aluminum wheels. High-quality products manufactured under precise design and strict quality control (MADE IN JAPAN). Hub bolts are made of chrome molybdenum steel, and hardened high-strength and high-durability bolts are used. Becomes a body and a tsuraichi, contributing to the cool appearance. Improved turning performance with wider tread. A special nut (for 11 to 15 mm) prevents the spacer from loosening. High reliability that can withstand hard sports driving. The included dedicated hub centric ring prevents blurring during high-speed driving. (A separate hub ring is required for the after-wheel) A wide variety of sizes for each car manufacturer due to the 2-piece structure. Product Description The Project KICS Wide Tread Spacer set is by far the best on the market today. Made out of durable and lightweight T6061 aircraft-grade aluminum, these spacers are sure to last and add a touch of style. The wide tread spacers include a unique lug nut system for 10mm up to 20mm units. Optional hub rings ensure a hub centric fit to any vehicle and wheel combination. JWL tested for safety. Project Kics creates some of the best lug nuts and automotive accessories on the market.  Project Kics is one of the most trusted names in JDM and Japanese racing performance. Project Kics is a member of the larger KYO-EI industrial corporation, which is one of the most trusted names in Japan when it comes to automotive accessories. For more than 50 years, KYO-EI has developed a number of unique parts that are heavily used in both street and racing applications and cover virtually every vehicle on the market. Designed and manufactured in Japan, KYO-EI uses only the highest quality materials in order to guarantee product reliability and longevity. Project Kics specializing in the manufacturing of high-quality metal-based products. It mainly focuses on wheel accessories like its famous wheel spacers, lug nuts, and magnetic locking wheel nuts. The company boasts a range of memberships and certifications, including ISO, NAPAC, and JAB, so you can rest assured that all Kics products are fabricated to only the highest standards.