Worn crank handles slip on the regulator shaft, and most cheap replacements have shallow splines that strip out within a season. This one is made on AMD tooling with correct length internal splines, so it grips the shaft the way the original did and the clip holds it there.

Auto Metal Direct W-407 Window Crank Handle Features:

• Fits 1965-1981 Buick, Chevrolet, GMC, Oldsmobile and Pontiac cars and trucks.
• Superior quality reproduction of the GM replacement style handle.
• Chrome diecast construction with the correct design and black knob.
• Correct length internal splines for tight engagement with the window regulator shaft.
• Retaining clip included with each handle.
• Sold individually.