Mill Aluminum L21S Series Standard Square Base Shoe Drilled with 13/16" Holes Pattern "D" 118-1/8" Length


Minimum Order

1 Each

Counter Bore X Depth

1-1/4″ (31.7 mm) x 1/2″ (12.7 mm)

Stock Length

118-1/8″ (3 m)

Hole Size

13/16″ (20.6 mm)

Holes Drilled C.T.C.

11-13/16″ (300 mm)



For 27/32″ (21.52 mm) Laminated Tempered Glass (10 x 1.52 x 10 mm)

Typically Used as the Base Channel for Laminated Glass Railing Systems

Drilled and Counter Bored 11-13/16″ Center-to-Center, or We Will Custom Drill to Your Specifications

Custom Cutting and Mitering Service

Test Reports Available

CRL Recommends Consulting with the Glass Fabricator Prior to Wet Setting Laminated Tempered Glass

CRL Glass Railing Systems Meets NBC Load Requirements When Installed in Accordance toICC-3842


CRL L21S Series Laminated Square Base

Shoe is used as the base channel for glass railing systems. It can be clad in four choices of architectural finishes. The most critical component in a railing system is the proper attachment of the Base Shoe to the substrate. CRL has engineered a variety of attachment methods, and has developed an acceptable combination of drilling patterns and fasteners. A printed brochure with instructions, installation hints, cleaning, and refinishing techniques is available.


For use with 27/32″ (21.52 mm) Laminated Tempered Glass (10 x 1.52 x 10 mm)

Thickness Range: .803″ to .903″ (20.4 to 22.9 mm) Will work with ASTM 7/8″ Monolithic Tempered Glass Will Not Accommodate the Full ASTM Thickness Range for 27/32″ Glass Important Notes: CRL does not recommend direct powder coating of this base shoe extrusion. Powder coated cladding applied over the base shoe is the recommended method. All pre-drilled CRL Base Shoes have a +1/8 (3mm) / -1/16 (1.5mm) tolerance between each hole drilled in the base. Before drilling installation holes in the concrete or steel substrate it is recommended that the installer place the base shoe into the planned final position, then mark the position of the holes to be drilled into the substrate.

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