Rolltrak Nylon Replacement Roller 29mm White SKU: 210404 MODEL: R4400 Error. try again later You've successfully joined the club $ 16 .88 each Available on orders $50 to $1500.More info × Mitre 10 Variants Bearing acetal convex roller with threaded stud axle. Features and benefits Diameter: 29mm. Load: 30ks each roller. Threaded 3/8 inch BSW stud axle. Suits various internal sliding wooden doors. Suits Trak, Sylon Junior, Centor and Henderson internal sliding wooden door.