Truth Entrygard Dual Arm Window Operator. This operator is the same as the Wi1510, except are arms are made of stainless Steel
To determine hand of operator, if your sash lock (window lock), is on the left, you would use a left hand operator. And if your sash lock is on the right, you would order the right hand operator.
Common numbers found on this operator are 30758 RH , 30757 LH, 30852, 20812, and 30767
Left hand shown.