Thomas & Betts BFH-29-0 PMA Conduit Support System. PMA Conduit Support System, 1-Piece Flexible, NW29/M32 Size, Network Rail Mounting, For Use With: PMAFLEX, PMA Smart Line NW29/M32 Conduit, Specifications: 20 mm THK, 1-Hole, Polyamide 6, Black, 48 mm H x 45.5 mm W x 20 mm D Dimensions, -40 to 105 deg C. Additional Description: TB -BFH-29-0 CONDUIT 1PC SUPPORT PA6 NW29 BLK. Catalog Description: PMACLIP One-Piece Black System Support with Safety Lid, Material - Polyamide 6, Fits to Conduit Size NW - 29, Metric - 32.