The spring hinge tension pin can correctly replace the broken 3.5-inch, 4-inch and 4.5-inch pins. The hexagonal wrench adopts a flat design, the wrench body is smooth and comfortable, and it adopts a 90-degree bending process. It will not rebound to save your energy and strength. It fits the socket on the top of the door hinge. The shelf support pin is made of high-quality stainless steel, and the hexagonal wrench is made of plated iron, which is stable and not easy to break. It is safe and reliable, with high hardness, strong toughness, and good working performance, allowing you to use it with confidence for a long time. Put the hexagonal wrench into the socket on the top of the spring hinge, rotate the wrench see hole, and then install the metal pin, and then test the door closing rate, repeat the test until the door closes and locks without banging; the replacement process is simple and takes no time. The spring hinge tension pin replacement kit is suitable for repairing and replacing self-closing door hinges, garage door hinges, kitchens, bathrooms, toilets, shopping malls, schools, offices, business buildings and other places. Closed door hinges, whether your hinge pin is broken or aged, can cope with it. You will get 12 pieces of stainless steel shelf pins and 2 pieces of hexagonal wrenches, sufficient quantity and complete combination to make repair and replacement work easier, you can also share with others or store some at will; Each metal pin is about 0.7 x 0.08 inches, and the hexagonal wrench is about 2.6 x 0.9 inches, the size is suitable for efficient and easy use Colour:As Shown Material:Stainless steel Package Contents: 1 set x door hinge repair kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.