Tubular latch with the ultimate in near silent operation. No more noisy latches scraping on strike plates. 57mm Backset measurements, 77mm case length (3 Inch) – See technical drawing for more details The body has two hole cut-aways to accommodate bolt through fixings for a secure fitting. In operation when closing the door the magnets attract withdrawing the bolt from the latch case pulling it into the frame mounted strike plate keeping the door held shut. When the door handle lever is pulled down to open the door the latch is pulled away from the strike plate and the rear magnet in the latch holds the bolt within the case. When the door is left open the bolt remains hidden within the door creating a sleek minimalist look and a great safety feature as nothing sticks out. Is suitable for all domestic, commercial and industrial use. Particularly effective if young children are in the house. Includes: Lock body, Round Faceplate, Round No-Lip Strike Plate, Magnetic Dust Box, and 4 x 30mm fixings screws.