Universal design ensures that it will fit on a wide variety of pulleys that feature holes or slots, including both crankshaft and camshaft pulleys Adjusts from 1-1/4" to 5" Use with 1/2" drive ratchet or breaker bar Accommodates the most common metric size pin configurations including: 3.5mm, 4mm, 4.5mm, 5mm, 6mm, 7mm and 10mm