Assorted colorful plastic glazelock shims including square horseshoe shims 4x3 inches with 7/8 inch slot
The image shows glazelock shims including u-shaped, snap-off, wedge-lock, and pre-scored wood shims in red and blue
Blue red and black interlocking stackable glazelock shims square horseshoe shims 4 x 3 with 7/8 inch slot
Black plastic glazelock shims with textured ribbed surface for secure installation 4x3 inch 7/8 inch slot
Black rubber u-shaped glazeLock shim with textured surface and embossed markings for 7/8 inch slot use
Red u-shaped glazelock shims with rounded edges and embossed circular patterns for square horseshoe slot use
Blue plastic u-shaped glazelock square horseshoe shims with embossed circular patterns and 7/8 inch slot
Brown u-shaped plastic glazelock shims with circular indentation and made in usa flag sticker for square horseshoe use
Brown u-shaped plastic glazelock shims 4x3 inches with 7/8 inch slot for precise leveling and spacing
Beige plastic glazelock shims square horseshoe seat cushion with small circular indentation and american flag sticker
Assorted colorful plastic glazelock shims including square horseshoe shims 4x3 inches with 7/8 inch slot
The image shows glazelock shims including u-shaped, snap-off, wedge-lock, and pre-scored wood shims in red and blue
Blue red and black interlocking stackable glazelock shims square horseshoe shims 4 x 3 with 7/8 inch slot
Black plastic glazelock shims with textured ribbed surface for secure installation 4x3 inch 7/8 inch slot
Black rubber u-shaped glazeLock shim with textured surface and embossed markings for 7/8 inch slot use
Red u-shaped glazelock shims with rounded edges and embossed circular patterns for square horseshoe slot use
Blue plastic u-shaped glazelock square horseshoe shims with embossed circular patterns and 7/8 inch slot
Brown u-shaped plastic glazelock shims with circular indentation and made in usa flag sticker for square horseshoe use
Brown u-shaped plastic glazelock shims 4x3 inches with 7/8 inch slot for precise leveling and spacing
Beige plastic glazelock shims square horseshoe seat cushion with small circular indentation and american flag sticker
Glazelock - Leveling Shims

Glazelock® Square Horseshoe Shims — 4" x 3" | 7/8" Slot

$108.90
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Made in USA

Glazelock® Square Horseshoe Shims — 4" x 3", 7/8" Slot | Made in USA

Glazelock® Square Horseshoe Shims deliver maximum stability with robust 4" x 3" dimensions and a large 7/8" slot. The square profile provides superior load-bearing capacity for demanding construction applications — invented by a window installer and made in USA since 1997.

Key Specifications

  • Dimensions: 4" x 3"
  • Slot: 7/8"
  • Shape: Square horseshoe (U-shaped)
  • Material: Heavy-duty plastic
  • Colors: Assorted
  • Origin: Made in USA since 1997

Key Benefits

  • Heavy-Duty 4" x 3" — Maximum load-bearing surface for demanding applications
  • Large 7/8" Slot — Accommodates larger pipes, anchor bolts, and hardware
  • Square Profile — Enhanced stability compared to narrower horseshoe designs
  • Assorted Colors — Easy thickness identification on the job site
  • Made in USA — Consistent quality since 1997

Perfect For

  • Heavy window and commercial door installation
  • Large cabinet and countertop support
  • Industrial machinery leveling
  • Structural and load-bearing construction applications
  • Applications requiring a large slot for bigger hardware

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 shim have? +
This 4" x 3" square horseshoe shim features a 7/8" slot, accommodating larger pipes, bolts, and hardware than standard 1/2" slot shims.
Are these shims color-coded? +
Yes. Glazelock shims are color-coded by thickness for easy identification during installation.

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