Comes in kit form, you must slide the pieces together and glue them into place.
2/Pack

The key for how to look at these dimensions is found next to the product image above.

6mm Size: R=1/4" (6mm) H=11/16" (11mm) f=1/8" (3mm)

8mm Size: R=15/16" (8mm) H=15/16" (12mm) f=5/32" (4mm)

10mm Size: R=3/8" (10mm) H=7/8" (22mm) f=3/16" (5mm)

12mm Size: R=15/32" (12mm) H=7/8" (22mm) f=1/4" (6mm)

Assembly Images

Provided in white plastic
6/Pack

Dimensions:
Width (at opening): 9/16" (15mm)
Height: 1 3/8" (35mm)

Approximate Scale: 1:25

Brass Metal Finish
2/Pack

Height: 1-5/16"
Diameter: 9/16"

Brass Metal Finish
2/Pack

Height: 1"
Diameter: 3/8"

Resin
2/Pack
5/8" x 1-1/8"

Resin
2/Pack
1-1/8 " x 3/4"

53" x 38" Louvered Vent
1/Pack

Height: 1-3/16"
Width: 1-5/8"

27" x 32" Louvered Vent
1/Pack

Height: 1"
Width: 7/8"

17" x 22" Louvered Vent
1/Pack

Height: 5/8"
Width: 1/2"

Nickel metal
10/Pack

Dimensions:
Width: 11/16" (18mm)
Height: 1/4" (6mm)
Depth: 1/4" (5.6mm)

Nickel metal
10/Pack

Dimensions:
Width: 1" (24mm)
Height: 3/8" (9.7mm)
Depth: 1/4" (6.6mm)