Right Angle Clamp Kit · Professional Grade
Ziptred™ ProSquare 90 – Right Angle Clamps for Woodworkers
Ziptred™ ProSquare 90 – Right Angle Clamps for Woodworkers
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Standard delivery 5–10 business days.
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Easy return process within 30 days. No questions asked.
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Ziptred™ ProSquare 90 – Right Angle Clamps for Woodworkers
Perfect 90° Angles.
Every Single Time.
Professional-Grade Aluminum Positioning Squares
Precision 90° Alignment
Engineered for absolute accuracy, these right-angle clamps ensure flawless 90-degree corners for professional carpentry and heavy-duty DIY projects.
Anodized Aluminum Alloy
Crafted from solid, rust-resistant aluminum alloy. The robust, anti-corrosion structure withstands heavy workshop pressure without warping, bending, or breaking.
Instant Setup & Locking
Designed for speed and simplicity. Just position, clamp, and secure—achieve an instantly locked corner joint without complex calibration or hassle.
Multi-Scenario Workshop Essential
The ultimate workshop companion for assembling boxes, drawers, cabinets, picture frames, and custom furniture with flawless structural integrity.
Dual Measurement Scales
Laser-engraved metric and imperial (inch) markings offer global compatibility. High-contrast scales allow for effortless, highly accurate measuring.
Technical Specifications
How We Stack Up
ProSquare 90 vs. The Alternatives
See how we compare to budget squares and name-brand options at your local hardware store.
| Feature | Ziptred™ 90-Degree Squares BEST VALUE |
Budget Squares (~$15) | Rockler Corner Clamp (~$55) |
|---|---|---|---|
| Material | 6061 Anodized Aluminum | Stamped steel / plastic | Cast aluminum |
| Angle Tolerance | ±0.1° | ±1–3° (varies) | ±0.5° |
| Dual Scale (in + mm) | ✓ Laser engraved | ✗ Inches only | ✓ |
| Locking Mechanism | ✓ Steel locking screw | ✗ Friction only | ✓ |
| Max Material Thickness | 2¾ inches | 1½ inches | 2 inches |
| Rust Resistant | ✓ Hard-coat anodized | ✗ Rusts over time | ✓ |
| Price (6 PCS) | $49.79 | ~$18–25 | ~$55 (single) |
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🚚 Fast Shipping
🔒 Secure Checkout
💸 30-Day Guarantee
🎧 24/7 Support
🚚 Fast Shipping
🔒 Secure Checkout
💸 30-Day Guarantee
🎧 24/7 Support
🚚 Fast Shipping
🔒 Secure Checkout
💸 30-Day Guarantee
🎧 24/7 Support
🚚 Fast Shipping
🔒 Secure Checkout
💸 30-Day Guarantee
🎧 24/7 Support
🚚 Fast Shipping
🔒 Secure Checkout
💸 30-Day Guarantee
🎧 24/7 Support
🚚 Fast Shipping
🔒 Secure Checkout
💸 30-Day Guarantee
🎧 24/7 Support
🚚 Fast Shipping
🔒 Secure Checkout
💸 30-Day Guarantee
🎧 24/7 Support
🚚 Fast Shipping
🔒 Secure Checkout
💸 30-Day Guarantee
🎧 24/7 Support
🚚 Fast Shipping
🔒 Secure Checkout
💸 30-Day Guarantee
🎧 24/7 Support
Straight answers, no fluff.
Questions We Actually Get
What thickness of wood can these clamps handle?
What thickness of wood can these clamps handle?
The clamps hold material up to 2¾ inches (70 mm) thick. That covers standard 2×4 framing lumber, ¾" plywood, and most hardwood stock you'd use in furniture builds. For thicker timber, you'd want a larger corner clamp.
Are these truly ±0.1° accurate, or is that marketing?
Are these truly ±0.1° accurate, or is that marketing?
The machining tolerance is ±0.1°, meaning each clamp is verified before shipping. That said, real-world accuracy depends on how you apply them — make sure your workpieces are flush to both arms before tightening. We recommend clamping both faces down to your bench if possible.
Collapsible rowDo these work with pocket screw joinery (Kreg-style)?
Collapsible rowDo these work with pocket screw joinery (Kreg-style)?
Yes, they work great with pocket screws. Set the corner with ProSquare 90, drive your pocket screws, then unclamp. The pieces hold their angle while you work without the clamp interfering with the pocket hole location.
How is this different from a cheap set on Amazon for $15?
How is this different from a cheap set on Amazon for $15?
The $15 sets are typically stamped steel or zinc die-cast with friction-only holding. They flex under pressure and drift off 90° as you work. ProSquare 90 uses a locking screw to fix the joint firmly. The 6061 aluminum also resists the slight flexing that cheaper materials show when you apply real clamping pressure.
What's your return policy?
What's your return policy?
30-day no-hassle returns. If they don't work out for your project, reach out at support@prosquare.com and we'll sort it out. No restocking fees, no runaround.
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