A518, A618, 46RE, 47RE, 48RE A727 4.2 Ratio Band Lever. The 4.2 ratio band lever provides greater mechanical clamping force than the O.E.M. 3.8 ratio lever. ie: Placing 1 pound of force on the tip of the apply lever produces 4.2 pounds of force on the band. CNC machined from 4140 HTSR for added strength.