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The exact term is stainless steel bolts, screws and screw caps. Stainless steel bolts and screws are round elongated objects with equidistant threads. The bolts are flat and cylindrical; the screws are like nails at the front.

Bolts need to be used with screw caps, perhaps on items that are now threaded.

Stainless steel screws are used on softer or thinner objects and drilled with their own threaded edges.

The threads on the bolts are shallow and have no sharp edges; the threads on the screws are sharper than the sharp edges and the threads are deeper, which facilitates drilling into objects.

Most bolts and screws require the simplest thing - a screwdriver.