Park’s Oversize Adjustable Saw Guide guides a hacksaw so that you can accurately cut fork steerers, airfoil-shaped seatposts and more. The guide is made to be held in a vise and it has hardened-steel cutting slots and a secure clamp for the part you’re cutting so that you make a perfect cut every time. The guide is compatible with round tubes from 1 to 1-3/4 inches in diameter and airfoil shaped parts up to 3.5 inches long. There are slots for standard and carbon-specific saw blades.