Accurately guides a hacksaw to cut aero-shaped seat masts and seat posts up to 3.5" (89mm). This versatile tool can also be used for fork steerer tubes and other round tubes from 1" to 1-3/4" (32mm to 45mm). The SG-7.2 features two different cutting slots--standard and carbon cutting blade widths. It has a hardened steel body with molded contact points to protect tubes and frames.