The aluminum Pivot Square has a locking, adjustable leg that firmly holds any angle from 0 to 90 degrees, so you can make repeated, consistent mark or guide your circular saw through marks or guide your circular saw through angled crosscuts.
This tutorial explains how consumables, including stick electrodes and other filler rods, are classified and sold. Welders Universe is a welding resource with information, links and videos for students, DIY welders and businesses.
Pretty rough looking, but I like the concept with the wire wheel for cleaning rust. Might make a modified version that can wrap around some rusty pipe workbench legs I've got to make cleaning them up easier.