Image 1 of 1 Tooling Arm $60.00 1.5” square aluminum tooling arm. Bolt holes are 1/2-13 spaced 1.5” apart and 3/8-16 spaced 2” apart. Length: 20" 17" Get notified by email when this product is in stock. Sign up to receive news and updates. Add To Cart Added! 1.5” square aluminum tooling arm. Bolt holes are 1/2-13 spaced 1.5” apart and 3/8-16 spaced 2” apart.