Some confusion often exists between the two types, and the writer has sometimes bought gross packets clearly labelled 'screw cups' which were in fact 'screw sockets'. The socket type
252:3A is recessed flush into the wood with a countersink bit, while cups (252:3B) lie on the surface and require no sinking. Both types are used for countersunk/flat head screws which may have to be withdrawn at any time, and also for neatness of finished appearance. The sockets are preferable but must be accurately fitted, and 253 shows the difference between screws carelessly placed and sunk, and those neatly fixed in sockets which are sanded off flush after the screws have been driven home.
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