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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🖤 Reinforce with style — because your furniture deserves the best corner support!

VERSATILE DIY ESSENTIAL - Ideal for a wide range of wood furniture projects — from chairs to bookshelves — empowering your inner craftsman to create and repair effortlessly.
MAXIMUM STRENGTH MINIMAL FUSS - Each L bracket supports up to 40kg (88 lbs) — perfect for reinforcing your bedframes, cabinets, and more with confidence.
SEAMLESS INSTALLATION EXPERIENCE - Countersunk screw holes and included self-tapping screws guarantee a flush, professional finish without protrusions or damage.
BUILT TO LAST DESIGNED TO IMPRESS - Premium stainless steel with sleek black coating resists rust and wear, ensuring your furniture stays solid and stylish.
COMPLETE KIT FOR INSTANT REINFORCEMENT - 16 brackets plus 64 screws mean you’re fully equipped to tackle multiple projects or heavy-duty repairs without hunting for extras.

The Blingstar L Bracket set includes 16 black-coated stainless steel corner braces and 64 matching screws, each bracket measuring 1.57x1.57 inches with 2mm thickness. Designed for heavy-duty wood furniture reinforcement, these rust-resistant brackets support up to 40kg per 4-piece set and feature countersunk holes for a sleek, flush installation. Perfect for DIY enthusiasts aiming to strengthen beds, cabinets, drawers, and more with durable, professional-grade hardware.

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TrustScore 4.5 | 7,300+ reviews

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The delivery time was excellent, and the packaging was secure.

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Mounting type	Corner Mount
Manufacturer	Blingstar
UPC	655100546479
Item Weight	308 g
Package Dimensions	11.51 x 6.3 x 2.31 cm; 308 g
Item model number	2701663b-8180-4541-a2b3-bc3f19716611
Size	16Pcs
Color	Black
Finish	Black, Painted
Batteries Required?	No

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

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