These bitts are cast from polymer and sold 1/pack.
Paintable

Sizes:
01: Width: 1", Hight: 1/2", Depth: 5/16"
02: Width: 15/16", Height: 3/4", Depth: 5/16"
03: Width: 1 3/8", Height: 5/8", Depth: 9/16"
04: Width: 1 1/8", Height: 5/8", Depth: 9/16"

Provided in black plastic

Dimensions:
Length: 9/16" (14mm)
Height: 1/4" (6mm)
Depth: 1/4" (6mm)
6/Pack

Provided in black plastic

Dimensions:
Length: 7/8" (22mm)
Height: 3/8" (9mm)
Depth: 5/16" (8mm)
4/pack

Provided in black plastic

Dimensions:
Length: 1 1/8" (28mm)
Height: 3/4" (18.5mm)
Depth: 5/16" (8mm)
6/Pack

Provided in a shiny brass metal
2/Pack

Dimensions:
Width: 15/16" (24mm)
Height: 5/16" (8mm)
Depth: 11/32 (9mm)

Resin construction
2/Pack
Width: 3/4"

Bollard

Resin construction
2/Pack
Width: 15/16"

Bollard

Resin construction
2/Pack
Width: 1-1/4"

Bollard
Resin construction
2/Pack
Width: 1-3/4"

Made from strong polymer, comes with threaded pins and includes nuts.
2/Pack

Dimensions:
Width: 15/16" (24mm) bollard arm span
Depth: 11/16" (18mm) base depth
Height: 1-7/8" (48mm) from bottom of bast to top of cap

Made from strong polymer, comes with threaded pins and includes nuts.
2/Pack

Dimensions:
Width: 2-1/2" (64mm)
Depth: 11/16" (18mm)
Height: 1-7/16" (36mm)

Black plastic
1/Pack

Dimensions:
Width: 1-5/16" (33mm)
Height: 1-5/16"
Depth (base): 3/4"