These high quality bolts will replace the hard to find IRS rear axle cap bolts. The 10mm threaded bolts used by VW had a 15mm socket size, so the commonly available ones with 17mm heads just don't look right in this location. This kit will also work great for the torsion bar cover plates on all 71 and later cars. The bolts are a tough 12.9 and are Zinc plated. Eight bolts and washers supplied. Made in USA.