PACK OF 8 HEAVY DUTY MOUNTING RINGS: This set includes 8 pieces of stainless steel D-mounting rings. The rings measure 4.6 x 3.8 cm and 6 mm thick. They come with mounting brackets. They are 2 x 5.6 cm in size and have holes with a diameter of 6.5 mm. The distance between the holes is 3.6 cm. Each set comes with 2 screws of 2.1 cm. LARGE CAPACITY BEARING: Our trailer mounting rings are sturdy and durable. Since they are made of stainless steel, they are rust and corrosion resistant. Each trailer hook can support a weight of 400 kg and offers a center width of 2.6 cm. Each attachment has been galvanized to ensure longevity. The mounting brackets attach the tire to wood or concrete surfaces. EASY TO INSTALL: Each car traction ring can be easily attached to the car with just two screws. This complete set includes all the screws you need to attach it to your home. your surface. Simply mark where you want to screw, drill your holes, and place the bracket and socket in its final position.