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Dark gray metallic glazelock heavy-duty interlocking u shims with circular indentations and central screw holes
Red plastic heavy-duty glazelock shims u-shaped tool with circular indentations and central protrusion for interlocking use
Red plastic glazelock heavy-duty interlocking u shims with circular indentations and central protrusion 4 x 3 inches
Blue plastic glazelock heavy-duty interlocking u shim with made in usa label and circular indentations
Blue plastic glazelock heavy-duty interlocking u shims with circular indentations and made in usa label
Red plastic glazelock heavy-duty interlocking u shim with circular indentations and central protrusion for secure fitting
Dark gray metallic glazelock heavy-duty interlocking u shims with circular indentations and central screw holes
Red plastic glazelock heavy-duty interlocking u shim with circular indentations and central protrusion for secure fitting
Dark gray matte plastic glazelock shims u-shaped tool with circular cutouts and edge holes for heavy-duty interlocking use
Blue plastic glazelock heavy duty interlocking u shim with made in usa label and circular indentations for precise fitting
Blue plastic glazelock heavy-duty interlocking u shim with made in usa label and circular indentations for 7/8 inch slot

Glazelock® Heavy-Duty Interlocking U Shims — 4" x 3" | 7/8" Slot

A partner brand, sold by FLI Products

Made in USA

Regular price$34.58
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Shipping calculated at checkout.

Thickness
Count
  • In stock, ready to ship
  • Backordered, shipping soon
  • Interlocking stacks: Shims connect when stacked to help reduce shifting during installation.
  • 4 × 3-inch profile: A broad shim footprint for compatible installation and leveling tasks.
  • 7/8-inch slot: The U-shaped opening fits around compatible pipes, bolts and anchor hardware.
  • Made in the USA: Heavy-duty plastic shims offered in Red, Blue and Black.

Dimensions and design

Each shim measures 4 × 3 inches with a 7/8-inch slot. The square U-shaped, or horseshoe, profile combines an open slot with an interlocking stacking design.

Installation uses

Use for compatible window, commercial door and construction installations where spacing or leveling is needed around hardware. Interlocking shims help keep a stack together while you work.

Choose for your application

Check the required thickness, hardware clearance and installation requirements before ordering. No load rating is specified here; match the shim to your project’s requirements.

Material and colors

Heavy-duty plastic. Colors: Red, Blue and Black. Made in the USA.

Find this product online and in stores — see Where to Buy

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FAQs

What are Glazelock shims used for? +
Glazelock interlocking plastic shims are used for leveling and aligning windows, doors, frames, and other construction applications. Their interlocking design locks stacked shims together to prevent shifting during and after installation.
What makes Glazelock different from regular shims? +
Glazelock shims feature a patented interlocking design that locks stacked shims together so they won't shift or slide out of position — a common problem with standard plastic or wood shims.
Are Glazelock shims Made in USA? +
Yes. Glazelock shims have been Made in the USA since 1997.
What slot width does this Glazelock shim have? +
This 4" x 3" Glazelock shim features a 7/8" slot, accommodating larger pipes, bolts, and hardware than standard 1/2" slot shims.
Are Glazelock shims color-coded? +
Yes. Glazelock shims are color-coded by thickness (red, blue, black) for easy identification during installation, saving time on the job site.

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