This is a casement crank handle is aluminum diecast and has a 3/8 in. bore spindle. This fits any operator with a 5/16 in. bore spindle such as the teardrop style casement operators (Prime-Line parts H 3502 & H 3508). It offers excellent torque for easy opening and closing of windows. The crank handle projects out from the operator 2-11/16 in. .