2 piece, after welding heat treated 4130 chromoly construction11 butted technology, with 3 wall thicknesses for a superior strength to weight ratioDeep knurled clamping area to prevent slip with a thicker bar bore Tig welded for increased durability22.230`10`2°11°GreenBMXChromolyUPC/EAN/GTIN: 888571101902