This is a coppertone finish left-handed, 9-1/2 in. single arm operator. It is made of heavy-duty diecast zinc with the baked on coppertone finish. The steel arm, worm drive and gears are protected with a corrosive resistant finish, and it opens to a full 90 degrees. The plastic roller on the end of the arm insure a smooth operation as it slide through the Prime-Line TH22397 track. When installing, the housing easily fastens down to the window sill.

this is a Truth hardware replacement left hand casement operator | works on a left handed casement window | heavy duty diecast zinc construction with coppertone finish | opens the window to a full 90 degrees | matching crank handle is included 

Arm is 9-1/2 in from the middle of the guide button to the middle of the crank operator while closed.