1. What is an escutcheon?
An escutcheon is a piece of door furniture the surrounds a keyhole or lock cylinder.

2. What is a thumbturn?
A thumbturn is essentially another method used to lock a door. It uses a simple twist mechanism instead of a key. These are usually used in bathrooms because of the additional privacy they provide.

3. What are thru-bolts?
Thru-bolts are fixings supplied with most door handles. They essentially pass through the levers on either side of the door, via holes provided in compatible locks and latches, and are tightened to the point where both handles are firmly held against each other. This is seen as the best way to fit door handles.

4. What is a spindle?
A spindle, used in door furniture, is a length of square metal bar which connects the door handles on either side of your door together. The spindle, located in the square holes found at the back of your door handles, passes through the tubular latch or mortice lock fitted into the door. When the levers of your door handles are pressed, the spindle rotates and operates the latch inside the door, allowing the door to open.

5. Will new handles work with my existing locks?
All modern locks use followers capable of facilitating spindles up to 8mm. Modern spindles are 7.9-8mm. Older locks may not facilitate modern spindles so it is a good idea to remove one of your existing door handles to measure the spindle it uses. Old spindles may be as small as 7.6mm.