The Truth Hardware (AmesburyTruth) 15 Series EntryGard Right-Hand Dual Arm Casement Window Operator with a 4-7/16" Link Arm (15.10) is designed for smooth and reliable operation in casement windows, perfectly complementing AmesburyTruth 14 Series Casement Window Hinges. Often referred to as a window crank, mechanism, or opener, this right-handed operator is engineered to support window sashes up to 60 lbs (27 kg), with widths ranging from 20" to 32" (508 – 813 mm) and heights up to 60" (1524 mm).

This operator is commonly identified with the stamp “31538” on the link arm, though you may also find alternative markings such as 20544, 2081, 20810, 30470, 30472, 30841, 30842, 30842L, 30842R, 31538A, 31539, 40754, 45136, or 45273.