The SG-7.2 cutting guide is a specially shaped guide, designed specifically to accept aero-shaped seatmasts & seatposts up to 3.5 inches (89 mm) deep The guide can also accept round tubes from 1-1/4 inch to 1-3/4 inch (32 mm to 45 mm) in diameter Two cutting slots are provided, one for standard saw blades & one for thicker, carbon specific blades Hardened steel body with moulded contact points to protect tubes & frames Made in the USA & covered by Park Tools legendary limited lifetime warranty