The BPW truck brake drum 0310677040 is a high-quality brake drum used in heavy-duty trailers. It has a drum diameter of 420 mm, a brake surface width of 214 mm, and a height of 275 mm. With a hub bore diameter of 290 mm and a bolt circle diameter of 335 mm, it features 10 bolt holes and weighs approximately 54 kg. This drum is designed for durability and reliable performance, making it ideal for commercial trailer applications​.