ABN Brake Line Tubing, 5/16, and 3/8 Forming Bending Bender Tool Pliers Designed to smoothly bend copper, brass, aluminum, and other thin walled steel tubing without crimping Three channel design for work on 1/4 (6mm) 5/16 (8mm) and 3/8 (10mm) tubing. Angles and bends etch marked on tool to provide simple and clear identification for easy use. Allows for 180 degree and or 90 degree bends. Precision machined aluminum alloy for extra strength and durability. 1/4 (6mm) 5/16 (8mm) 3/8 (10mm) copper brass aluminum other thin walled steel tubing