Precision Brand horseshoe shims, made of high impact plastic, are economical and colour-coded based on their thickness. They are available in a variety of sizes and have excellent compressive strength of 10 to 12,000 psi. Using horseshoe shims saves you time, labour and money. Horseshoe shims are unaffected by micro-organisms and alkalis, ground chemicals and liquids. Furthermore, they will not rust, stain or leach, making them suitable for levelling surfaces when installing windows, curtain walls, doors and cabinets.