Truth TH 23021 9-1/2 In. Single-Arm Left-Hand Casement Operator (Single Pack)
Mounting holes 1 5/8 in., 2 7/32 in. and 3.0 in., arm length 9 ½ in. from the middle of the crank operator while closed to the center of the guide button, guide button is 9/16 in.