Low Profile Design Quickly and Easily Disengages the Line from Jiffy-tite Quick-Connect Fittings without Removal of the Clip. The teeth of the tool fit perfectly into tight tolerance of Jiffy-tite® connectors and when rotated allow the line to be pulled without damage to the connector or retaining clip so they can be reused. Includes four sizes: 3/8\", 1/2\", 5/8\"-30% and 5/8\"-39%. All sizes are available individually. Also available is the 3/4\" Low Profile 3/4\" Jiffy-tite Disconnect not included in the set.(22970) 22930 Low Profile 3/8\" Jiffy-tite® Disconnect 22940 Low Profile 1/2\" Jiffy-tite® Disconnect 22950 Low Profile 5/8\"-30% Jiffy-tite® Disconnect 22960 Low Profile 5/8\" - 39% Jiffy-tite® Disconnect 22970 Low Profile 3/4\" Jiffy-tite® Disconnect (not incl in kit) *made out of brass Reason for percentage on 5/8\"- Its the engagement of the tube in the fitting. So the 39% is on older GMs and then they switched to the 30% in about 2000. So the diameters are different to go inside the connecter. This is the only way for Jiffy-Tite to tell the differences in the 5/8 disconnects.