This is a Butterfly Bracket with Rocker Arm primarily used with an 8″ Hydraulic Retracted Closer and sometimes a 10 Inch Hydraulic Retracted Closer in both Left or Right Side Hinged Laundry Chute Intake Doors, including 15″x15″, 18″x18″, 21″x21″ and 24″x24″. Butterfly Bracket, Rocker Pivot Arm, Socket Shoulder Bolt, Lock Nut, 1/8″ Tinnerman Nut, Rivet, x2 Stainless Steel Door Mounting Sheet Metal Screws. ( Look at the pictures, and you will receive the identical product and parts ) This is for use with Left or Right Side Hinged Chute Intake Doors 15″x 15″, 18″x 18″, 21″x 21″, and 24″ x 24″. Laundry, Linen, Trash, Garbage, Rubbish, and Recycle UL rated doors. Wilkinson Hi-Rise, Wilkinson Chutes, Chute Systems, Western Chutes, Midland Chutes, and others.