Even insertion of 1", 1-1/8", 1-1/4" and 1.5" headset bearing cups into the head tube. Also suitable for BB30 bearings, as well as press-fit and press-fit-30 bearings. Quick-release for fast assembly and disassembly. Especially long handle (30 cm) for optimal leverage and thus easy operation. CNC-milled graduations for precise fit.