SISI UK is one of the leading manufacturers and suppliers of world class quality hardware products in UK. SISI UK Ltd is a family run business that has been established for over 30 years. They are distributors of hardware, ironmongery, DIY, household, security and pest control products. They are well known for their fast and professional service. The tapered plate insures a tight fit. Slotted hole is inverted, so that you can fix this plate in pairs to the top inside edge of the frame, pointing down. Two matching round head screws into the wall will slot into the keyholes, providing a hidden fixing.