3-Axis SquareThree axis square is a unique solution to clamping in 3 axis at once. Use the inside or outside faces. 4 machined faces on both the inside and outside of the square. No limit on inside face, large 4 height limit on outside face, Ductile cast iron for tensile strength Balanced to sit on its front feet, with additional small magnets on the front feet to resist tipping. Feet of the square are 1 wide to match our Fireball Fence Block fixture system Tapped