20 piece ACER Racing Titanium Lug Bolt set for many cars (please check your OEM lug bolts and compare with photo for proper fitment).These lug bolts are M14x1.5 thread with a cone seat. 28mm shank length measured from the base of the ball cup to the end of the threads. Manufactured from aerospace grade 6AL4V Titanium, these titanium lug bolts will not corrode or rust and offer a significant weight savings over steel lug bolts while giving a very sporty and aggressive look. Titanium is 50% lighter than steel, yet considerably stronger. Titanium is also resistant to the constant heating and cooling cycles common to high performance wheels that otherwise destroy steel studs and bolts. Rolled threads for superior fatigue resistance.