Dynamic Clamp - Pack of 4 - SPT-012 Made out of aircraft aluminum protected by red anodized plating Self adjusting with no additional support needed from .001 Low profile for maximum tool holder clearance Swivel cam action allows straight down clamping force with multiple positions on a sub plate Based on 1/4-20, M6 bolts Part# SPT-012, other sizes 5/16-18, M8 Part# SPT-013