Shimpo FG-M6JAC5U Grip Adapter. Shimpo Jacobs Chuck Grip 100 lb Capacity, Accepts Samples from 0.05mm to 5 mm, M6 Thread. Designed for testing low gage wire and rigid rods; accepts material diameters from 0.02" (0.05 mm) to 0.20" (5 mm). Shimpo parts and accessories.