[Size]: Cylinder: 18mm x 35mm, panel: 26 mm x 53 mm, anti-collision panel: 34mm x 53mm [Material]: The ball door bumper is made of stainless steel brass, sturdy durable, anti-rust anti-corrosion [Adjustable]: Adjust the appropriate distance by adjusting the distance between the ball bearing lock the deflector Lasting tension maintains spring rebound [Application]: Adjustable ball bearing latches for internal french doors The wardrobe is suitable for all kinds of invisible doors, cabinet doors, flat doors, wall cabinet doors, etc [Installation]: Equipped with screws, the ball retainer is installed on the top of the inner door, which is recessed into the drilled hole on the top surface The strike plate is mounted on the door frame the spring loaded ball locks holds the door closed package:Pack of 2 ball door bucklesnote:Manual measurement, the size has slight errors installation:1 Place the locking latch in the center of the edge of the door Mark drill a hole 20mm in diameter 30mm in diameter 2 Position the clip in the hole, mark the shape of the screw hole the board Remove the lock, drill the screw the chisel plate Secure with screws A Locate the firing pin on the door frame to line it up with the ball catcher (the curved edge is facing out) Mark the screw hole the shape of the contact