What are the inside dimensions of the "U" opening?

A 2x4 piece of lumber fits just right.

What is the space from top hole to bottom hole. I want to mount the brackets on a horizontal fence 2x4. Will the brackets fit ok on a horizontal 2x4?

The top hole to bottom hole is 5”. You’d have to mount on a 2 x 4 vertically. 2 x 6 or wider would work horizontally.

Please verify the bolt and/or screw hole diameter .... thanks, e-jay

Hello, The diameter of the bolt body is 5mm, hope this help you.

What the internal width of the bracket? i need something that is 53mm?

The width of the metal bar used in the brackets is 1.5625 inches and the opening space (designed for a finished 2 x 4 piece of lumber) is 1.6875 inches at the bottom of opening and 1.75 inches at top of opening. I wasn’t sure which measurement you were asking about so gave you both measurements.

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🛡️ Lock down your space with unshakable strength—because your peace of mind can’t wait.

RUSTPROOF ARMOR - Durable powder-coated finish ensures long-lasting protection against weather and wear
UNBREAKABLE DEFENSE - 4mm carbon steel frame absorbs high kick & push force without bending
EFFORTLESS SECURITY UPGRADE - Tool-friendly design with included hardware lets you fortify your home in minutes
PRECISION FIT FOR 2 X 4 LUMBER - Custom-designed brackets perfectly hold standard 2x4 bars for maximum door reinforcement
UNIVERSAL DOOR COMPATIBILITY - Works seamlessly on inswing and outswing doors—garage, basement, barn, and more

AINAFIX Door Barricade Brackets come in a 2-pack, engineered from 4mm powder-coated carbon steel to reinforce doors using standard 2x4 lumber (not included). Designed with a U-shaped, rustproof frame and included mounting hardware, these brackets install quickly on any inswing or outswing door, providing robust resistance against forced entry for garages, basements, sheds, and more.

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Unit Count	2.0 Count
Item Depth	1.5 inches
Mounting Type	Door Mount
Manufacturer	AINAFIX
Part Number	HOMESAFE01
Item Weight	1.63 pounds
Package Dimensions	6.38 x 2.83 x 1.77 inches
Item model number	HOMESAFE01
Style	Black
Finish	Powder Coated
Shape	U Shape
Item Package Quantity	1
Batteries Included?	No
Batteries Required?	No

Door Barricade Brackets,AINAFIX 2 Pack Drop Open Bar Holder for Home Security, 2x4 Bar Brackets Prevent Unauthorized Entry, Carbon Steel,Black

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