These are available in countersunk/flat, round head and raised/oval head forms, and have a cross slot in lieu of the single slot which gives less tendency for the screwdriver to ride up axially as torque is applied, and therefore less danger of marring the work if the driver slips. Special shaped screwdrivers are required and advantages claimed are more positive engagement of the driver in the slot, easier alignment of the screw and the work, particularly at difficult angles, increased speed of driving and more power. This type of screw has almost universal application in production-work with power screwdrivers for rapid assembly, but the conservative craftsman still clings faithfully to the conventional screw, and on balance the single-slot screw would appear to be more decorative, although this may well be the prejudice of ingrained habit.
As every workshop inevitably collects an assortment of odd screws over the years, a useful screw size gauge can be made by inserting a large-diameter screw in a piece of scrap wood, nipping two short lengths of brass strip round
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