Weighing in at only 36g (approx), this is a perfect component to keep in your workshop or backpack for highly efficient results. This model checks the following: & Oslash;38x 45° to check the depth of 1" Integrated head tube with & Oslash;38x 45° Bearings & Oslash;41x 45° to check the depth of 1-1/8" Integrated head tube with & Oslash;41x 45° Bearings & Oslash;41.8x 45° to check the depth of 1-1/8" Integrated head tube with & Oslash;41.8x 45° Bearings & Oslash;44x 45° to check the depth of 1-1/8? Internal head tube with & Oslash;44x 45° Bearings