Profile Design Boa 25.4 120mm 110d Silver 1" Quill Mountain Stem AL-6061-T6 1" A = 12mm, B = 73mm 1-1/8" A = 24mm, B = 65mm 185-277 grams Quill Insertion Diameter: 25.4mm for 1-1/8" stems and 22.2 for 1" stems