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3″ x 4″ Horseshoe Shims

Price range: $93.36 through $134.82

Large-format traditional horseshoe shims for leveling, spacing, and alignment. The 3" × 4" U-shaped design provides a broad bearing surface and accommodates bolts, anchors, and fasteners up to 7/8", while the familiar non-interlocking design is ideal for installers who prefer a traditional horseshoe shim.

  • Details

    3″ × 4″ TRADITIONAL HORSESHOE SHIMS

    Glazelock 3″ × 4″ Traditional Horseshoe Shims provide a large, stable footprint for leveling, spacing and alignment in window and door installation, glazing, storefronts, and other construction applications.

    The U-shaped profile accommodates bolts, anchors, and other fasteners up to 7/8″, allowing the shim to be positioned around installed hardware without removing the fastener. Multiple shims can be stacked to achieve the required spacing, while the broad 3″ × 4″ footprint provides additional bearing area where a larger shim is preferred.

    Made from durable high-impact polystyrene, these plastic shims will not rot, shrink, or swell like wood. Their smooth, non-interlocking design provides the familiar horseshoe-shim configuration preferred by installers who use traditional shims.

    For applications where keeping stacked shims connected during installation is useful, Glazelock also offers 3″ × 4″ Interlocking Horseshoe Shims, which snap together without tape or glue.

    Glazelock Shims are made in the USA.

  • Specifications

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  • Shipping

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What our customers say.

  • We have been using Glazelock’s Interlocking shims for over 5 years now. They simply snap together to get our desired thickness. No more taping or glue shims together, saving us time and money.

    – Roger, Starline Architectural Windows Ltd.
  • We at Softer Lite Window Company use the Wedgelock Shim and are pleased with this great product.  My installers find it more efficient and cost-effective, and an easier and faster way to get the job done right-the first time.  We recommend the Wedgelock Shim and all of the Glazelock products.

    -Mark Kane, President, Softer Lite Window Company
  • Glazelock is our go to company for all our shim needs.  We’ve never had any problems with the product received.  The customer service provided goes beyond expectations-we can see our product ordered as soon as the next business day.

    -Lindsey Holmes, B&D Contractors, Inc.
  • I like using Glazeock’s Stackable Shims because they have the ability to stack well and make the right size shims for the job.

    -Jared, EGR Inc.

Why use Glazelock Shims?


  • Invented by a window installer.

  • Easier placement.

  • Reduces material and labor costs.

  • Secure and Stable.

  • Simplifies installation in a multitude of applications.

  • Proudly made in the USA.

  • Multiple sizes and variations available.

Shipping Info


All In-stock orders received by 2pm CST are shipped same day. Products shipped by UPS and/or Common Carrier We will ship Ground/Best way.

If you need an order expedited please give us a call and we can quote you for Next Day Air and Second Day.