Aluminium Round Tube Alloy Metal Pipe 1 METER LONG 1m Alloy 6mm upto 102mm. £ (£/m) 140 sold. VARIOUS SIZES OF ALUMINIUM FLAT BAR BILLETS SQUARE FLAT ENGINEERING BAR MILLING. £ 150 sold. model makers brass round bar rod 1mm 2mm 3mm 1/8" 1/16" 3/32" £ 639 sold. Round Plastic Black/White Blanking End Cap Caps Tube Pipe Inserts .