Bolt for mounting handles on doors has threaded section part of way down its shaft which fits into door, peripheral groove below bolt head allowing handle to be fitted and shaft having longitudinal bore for cables attached to e.g. bell

摘要

The bolt for mounting handles on doors has a threaded section (6) part of the way down its shaft (4) which fits into the door. A peripheral groove (10) below the bolt head (8) allows the handle to be fitted. The shaft has longitudinal bore (9) for cables attached to a bell or entry phone.