KEY FEATURES MAGNETIC SQUARE: This Johnson construction square is perfect for builders and welders. It has a solid aluminum body with CNC machined edges for greater durability and accurate readings every time. HANDS-FREE USE: This rafter square has powerful magnets that enable the hands-free operation and ensure the square does not fall while in use; allowing you to complete any job with ease. APPLICATIONS: The magnetic edge of this layout tool attaches to ferrous metal; making it excellent...