Truth Encore Series Dual Arm, LOW PROFILE, casement operator. The encore series dual arm operator is designed to operate sash sizes from 24 to 40 inches wide and up to 84 inches tall, weighing up to 108 pounds. Window Type: Wood and Vinyl Casement Link Height: 31/64 inches (12.3mm) Bottom Link: Offset - Curved Handing: Right Hand Cover & Handle: Designed to be use used with Tango folding handle and cover Shoe: Square metal clip Truth # 31877 Track: 14-1/4 inch Truth # 41014 NOTE: the Standard Profile looks about the same - has 39/64 link height and bottom link is Straight. Related Parts: 50.11.00-LH - Truth Encore Dual Arm Operator - Left Hand 55104 - Track only 14-1/2 inch 55090 - Guide shoe ( Square)