6082 Aluminium billet 
1 x 4.5" dia x 28 mm long 
6082 aluminium alloy is an alloy in the wrought aluminium-magnesium-silicon family. It is one of the more popular alloys in its series, although it is not strongly featured in ASTM standards. It is typically formed by extrusion, cold and hot stamping, and rolling, but as a wrought alloy it is not used in casting
Maybe longer  never shorter