Nuts & Bolts ECH has an extensive range of plow bolts and nuts made from high quality alloy steel heat treated to Grade 12.0 mechanical properties. Make Product Enquiry Download Wear Parts Brochure Shims Available from 25mm to 120mm Internal Diameter in thicknesses of 1mm, 1.6mm & 3.0mm Make Product Enquiry Download Wear Parts Brochure