24 x TUBE JOINERS Suits TUBE: 40mm Nominal Bore. 40NB X 3.2 WALL DIAMETER 41.8mm ends WHERE IT FITS INSIDE YOUR 3.2mm WALL PIPE. 24 x Female Half 24 x Male Half 48 x M10 Grade 12.9 Bolts Dimensions: OUTSIDE DIAMETER: D = 48.5mm PIPE INSIDE DIAMETER/DIAMETER OF ENDS OF JOINERS : C = 41.8mm These are most often used in external Scrub Bars on off road vehicles. Easy to use and the 40NB pipe is readily available. IMPORTANT LEGAL and SAFETY CONSIDERATIONS Billet Race Craft makes no claim as to the suitability or safety of this joint when used in a safety cage. Although a similar design and steel as approved joints, the 40NB has not been tested by any certified lab and is not approved for use in a safety cage designed to protect the occupants.