Heavy Duty Construction: Crafted from premium Q235 carbon structural steel with a black powder coating, this 2-piece door installation kit supports up to 750 lbs and offers anti-corrosion and rust protection—perfect for even the heaviest doors in commercial or residential projectsAdjustable for Various Door Sizes: Designed to accommodate doors from 0 to 1.89 inches thick, this door lifter tool easily adjusts to fit pre-hung, slab, or front doors, making it a versatile solution for all your door installation needs360° Rotating Wheels with Brake: Each door dolly features smooth-gliding, 360-degree wheels for effortless movement. Use the built-in brake to securely hold and position your door panel during installation for precise, hassle-free resultsHands-Free & One-Person Operation: Engineered for solo use, this door installation tool allows you to maneuver, adjust, and install doors hands-free—saving time and boosting efficiency whether you're a professional installer or DIY enthusiastSimple & Efficient to Use: To install, just place the door panel on the tool, adjust the clamp to secure, and roll the door to your installation site. Fine-tune the height, lock the brake, and you're ready to install—no extra help or lifting needed