What is the correct drill bit size for pre-drilling screw holes?

The corner braces come with wood screws that are only 1/2" long. In many softer materials, such as wood or plywood, no tap-hole will be needed--the screws will be effectively self-tapping.

Can we use this on a metal square tube to hold the wooden plank?

With a proper hole drilled into the metal tube, a sheet metal screw could be used. The same type screws could work for attaching o the plank, assuming proper diameter holes were drilled.

Thinking of using these to shore up a cheap, particle board shelving unit. Would this work?

I used them to mount 3 19x15-inch 11/16-inch thick particle board shelves in a utility closet and they're holding well. Byu the way. I tried to drill a third mount hole in a bracket and when the drill heated up the bracket, it hardened, ruining a drill bit. My brother told me about this tendency with certain grades of steel and apparently this is one of those. Back to your project. If the shelves aren't too long or the particle board too thin, and prone to bowing under weight, these will work. If the shelf can bow, I believe the weight will eventually pull the screws out of the board rather nastily. hth.

Can I use these for corner shelves and will they hold them up themselves?

Yes they work with everything! They are small so use a couple to hold a small shelf on each side

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Blingstar L Bracket Stainless Steel Corner Brace 16 Pcs 1.57x1.57 Inch Joint Right Angle Bracket 90 Degree Corner Fastener for Wood Furniture Bedframe Cabinet Drawer Chair, with 64 Pcs Screws, Black

Product ID: 335571053

Details

Brand
Blingstar
Colour
black
Finish type
Black Painted
Item weight
0.31 Kilograms
Material
Iron Stainless

🔩64 premium self-tapping screws

🖤black coated anti-rust steel

🛠️16 pcs heavy-duty braces

Description

🖤 Elevate your furniture game with stealthy strength and sleek style!

COMPLETE DIY KIT - 16 L-brackets plus 64 screws for seamless, all-in-one installation
SLEEK SAFE DESIGN - Smooth black coating with rounded edges prevents scratches and adds style
VERSATILE APPLICATION - Perfect for beds, cabinets, chairs, shelves—your furniture’s best friend
EFFORTLESS INSTALLATION - Countersunk holes and deep-thread screws ensure flush, secure fastening
ROCK SOLID REINFORCEMENT - Supports up to 40kg per 4 brackets for wobble-free furniture stability

The Blingstar L Bracket set includes 16 robust 1.57x1.57 inch stainless steel corner braces with a black anti-rust coating and 64 matching self-tapping screws. Designed for professional-grade reinforcement, each bracket features countersunk holes and smooth rounded edges for safe, flush installation. Ideal for securing and stabilizing wood furniture like beds, cabinets, and chairs, this set supports up to 40kg per 4 brackets, making it a must-have for DIY enthusiasts seeking durable, stylish, and reliable corner fasteners.

Specifications

ASIN	B088PQ4QVN
ASIN	B088PQ4QVN
Brand Name	Blingstar
Color	black
Customer Reviews	4.6 4.6 out of 5 stars (3,328)
Customer reviews	4.6 4.6 out of 5 stars (3,328)
Date First Available	11 July 2020
Finish Types	Black, Painted
Item Depth	38 mm
Item Weight	0.31 Kilograms
Item model number	2701663b-8180-4541-a2b3-bc3f19716611
Manufacturer	Blingstar
Manufacturer	Blingstar
Material Type	Iron, Stainless Steel
Model Number	2701663b-8180-4541-a2b3-bc3f19716611
Mounting Type	Corner mounting
Package Dimensions	11.51 x 6.3 x 2.31 cm; 308 g
Set Name	set of 16 corner brackets
UPC	655100546479
Unit Count	16.0 Count

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