This standard shape clear flight and short clear stem incorporates the innovative Condor Zero Stress concept. This short clear flight is measured from the ridge of the screw to the joint/link between the clear flight and the short shaft. Shaft length: 21.5mmThis standard shape clear flight and medium clear stem incorporates the innovative Condor Zero Stress concept. This medium clear flight is measured from the ridge of the screw to the joint/link between the clear flight and the medium shaft. Shaft length: 27.5mmThis standard shape clear flight and long clear stem incorporates the innovative Condor Zero Stress concept. This long clear flight is measured from the ridge of the screw to the joint/link between the clear flight and the long shaft. Shaft length: 33.5mm