Durable Material: Made of high quality plastic and metal, these screws are durable and never rust. durable and reusable, can be used for years. Easy assembly: no tools required and no damage to the wall. Just twist the nut and create a force back against the wall. These hauck grille replacement parts are adjustable and easy to assemble. Size: 4 set screws packed. Size: M10, diameter 10mm, length 90mm, fits any 10mm pressure mounted baby or pet door. Please check the size before purchasing. Wide Application: Fits all 10mm pressure gates, baby and pet gates, safety gates, child safety gates, door stair gates, door security gates. Suitable for most places, walls, stairs, etc. Secure design: the rubber ends of the baby gate screws protect your stairs from scratches and allow you to attach a baby safety gate to the stairs against a baluster or round bar.