Pre-heating before bending is required in case of poor bending results. Widely Applicable: Applicable pipe outer diameter: 1/4" to 7/8". VEVOR versatile ratcheting tube bender is widely used in plumbing, floor heating, refrigeration, air conditioning, and hydraulic systems. A professional tool for industrial-grade or occasional use to simplify pipe connections. 90 Bending in Both Directions: The compact pipes bender kit is perfect for bending soft copper and aluminum pipes up to 90 degrees, and comes with a reverse bending tool that helps bend pipes in "forward" and "reverse" configurations, making it suitable for hard-to-reach areas. Mechanical ratchet for fast and precise bending.