Slide-Co 173234-A Window Tee Crank Casement Handles, Aluminum (2-Pack) Insert sizes for the following splines 9/32in., 5/16in., 3/8in., 3/8in.(extra deep), and 11/32in. Aluminum finish Zinc die cast tee-handle and plastic spline inserts Inserts allow this tee-crank handle to fit most casement operators