INTEGRATED HEADSET GAUGE, STAINLESS STEEL MATERIAL : 38X45 TO CHECK THE DEPTH OF 1`` INTEGRATED HEAD TUBE WITH 38X45 BEARINGS. 41X45 TO CHECK THE DEPTH OF 1-1/8`` INTEGRATED HEAD TUBE WITH 41X45 BEARINGS. 41.8X45 TO CHECK THE DEPTH OF 1-1/8`` INTEGRATED HEAD TUBE WITH 41.8 X 45 BEARINGS. 44X45 TO CHECK THE OF 1-1/8`` INTERNAL HEAD TUBE 44X45 BEARINGS, WEIGHT: 36G.