Uniform pressing 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 therefore easy operation. CNC-machined increments for exact fit.