Curtis Industries Distance calibration block – DC Curtis industries| 4128 Curtis Industries Distance calibration block – DC Print Curtis industries| 4128 Curtis Industries Distance calibration block – DC QXX-5002 DC block, carbon steel 1018, with wood case. QXX-5002A DC block, 7075-T6 aluminum, with wood case. QXX-5004 DC block, 304 stainless, with wood case. Request for information