EASY INSTALLATION – Features adjustable hinges for simple setup. The hinge is three-dimensionally adjustable: vertical 2.5mm, horizontal 2.5mm, and depth 1.0mm. Hinges can be adjusted without disassembling the door, making them ideal for concealed door applications. This product requires drilling and grooving, which may require basic DIY skills. If you are not familiar with the installation process, professional installation is recommended. COMPLETELY CONCEALED DESIGN – Concealed hinges are suitable for use with hidden doors, folding doors, and feature walls. Seamless hidden hinges provide a clean, stylish appearance. PRODUCT QUALITY – Our hinges are constructed from high-quality zinc and alloy materials. Wear-resistant nylon gaskets help ensure quiet, smooth operation and long-lasting durability. Designed for strength and reliability, these hinges offer excellent value. INCLUDED COMPONENTS – 2 invisible door hinges, 1 detailed instruction manual, a set of three-dimensional adjustment tools, 2 door gap thickness gaskets, and corresponding drilling bits. SPECIFICATIONS – Dimensions: 7 x 2.8 x 1 inches. Four-axis stable load-bearing design. One hinge supports up to 87.5 lbs; two hinges support up to 175 lbs. Compatible with doors having a thickness greater than 40mm and width under 1000mm.