Lockwood 3787 Dual Cylinder-Lower Cylinder Mounting Kit3787-KIT570E PLEASE NOTE: This item is Non returnable. Upon placing your order, it CAN'T be cancelled or returned (unless faulty or damaged) This is a non-stocked item which leaves the warehouse in 8 business days after payment is made. Dual Cylinder is a lockset or deadbolt that has a key-operated cylinder on both sides of the door (inside and outside) Dual Cylinder Function - allows a key cylinder to be fitted on both sides of the door, enabling secure operation from either side. Features: Lower cylinder mounting kit suitable for use with Selector 3782 Series Mortice Locks. Required to fix lower cylinder in place or when converting a single cylinder Selector® to a dual cylinder 570ESCBK required Specifications: Door Thickness: 43mm to 46mm