ULTIMATE DISCREET & SLIM ELEGANCEThese hinges maintain the original invisibility and adjustability and are thinner than most on the market. Unlike traditional hidden door hinges that mar your door with deep excavations, ours require only a minuscule 0.2"-0.5", preserving your door's integrity. DIY INSTALLATIONThis requires slotting and is not a standard size, but is more suitable for DIY concealed door projects!!! Hinges fitted to the door frame section: 4.7*1.45*0.5 Inch, Hinges mounted on door leaf section: 3.8*0.96*0.2 Inch. The package contains 2 hinges, screws, an instruction manual and 2 wrenches.PURCHASE GUIDELINESMade of zinc alloyembryo and aluminum alloy core materials. Door Opening Angle: 110; Door Thickness 1.57 in(40mm) thick or more.Two concealed hinges Load Bearing: 133lb. 2 products Packaging Weight: 1.3lb.INVISIBLE PERFECTIONWhen discretion is paramount, our hidden hinge design delivers. With a near-invisible gap when closed, these hinges disappear seamlessly into your door frame, ideal for secret passages or areas where a clean, uncluttered look is essential. Regardless of door orientation, they remain invisible from both sides, enhancing both aesthetics and security.PRECISION ADJUSTMENT & SILENT OPERATIONWith our unique adjustable design, you can fine-tune the hinges for perfect alignment. Adjustment 3 mm up/down, 1 mm forward/backward. Additional built-in gasket for silent opening and closing (no need to add lubricant).