Rolltrak Fly screen Replacement Roller 29mm SKU: 210390 MODEL: R4170 Error. try again later You've successfully joined the club $ 11 .88 each Available on orders $50 to $1500. More info × Mitre 10 SAvailable at selected stores. Check your local store for details Variants Bearing acetal grooved roller. Features and benefits Diameter: 29mm. Narrow Axle Diameter: 4.2mm. Load: 15kg each roller.