Product Description s are made of ChroMoly steel with puller. Technical Information:Material:steel (CrMo)Size:M8Tool Drive:8 mm hex driveManufacturer Number:390-2000 Contents:2 x s2 x washers2 x bearing assembly tools Weight: universal: 36 g Manufacturer: F.S.A. S.R.L. Via Francesco Petrarca. 4 20123 Milan Italy info@fullspeedahead.com