Crafted specially for bypass barn door hardware solutions, RealCraft's line of Box Rail Sliding Hardware sets the industry standard by starting with better raw material, adding precision machining, and offering more flexibility to the install process. But the secret… is all in the trolleys. The level of craftsmanship that goes into our box rail trolleys is unmatched. Each one is manufactured from 303-grade stainless steel, then outfitted with durable high-density polymer wheels to ensure years of smooth operation and dependability. Reach out at 1-800-694-5977 with any questions.