As you tighten the screw, you'll clamp the components tighter together. Assuming that the ends were cut square, you'll end up pulling your job square within reasonable limits.

Confirmat is a name that many people may find puzzling at first. It comes from the Latin language (lat. confirmare) and has several meanings. Among them is also the meaning "to strengthen", "to confirm". Confirmats owe their name to the fact that they are used to create very strong bonds. In addition to their robustness, confirmat screws are characterised by their relatively large diameter. On the market there are both fully threaded or partially threaded bolts. In the latter case, the smooth part of the screw usually covers no more than approx. 1/3 of the screw length. This type of screw is distinguished from others by a modified cutter shape. This design reduces the likelihood of chipping of the material into which the confirmat is embedded. In practice, therefore, once set, the confirmat will provide a strong connection, which should not loosen even after a long period of time. Confirmats are available with cross and hex head recesses. They are available in both natural and coloured forms. Standard diameters of confirmats are 6.4 mm and 7.0 mm, but you can also find mounting screws in other sizes. One of the most popular non-standard sizes is the 7.9 mm with a length of 33 mm. Re: the drill holes, I'd drill the 7mm then the 5mm - you'll get a better quality of visible hole edge and the central cone left by the 7mm drill with provide a centring point for the 5mm drill. (Assuming that the drill sizes required are 7 and 5mm.)

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Re:biscuits, Dowels are normally used to provide additional hidden strengtheners for the shelves, top/bottom and also to avoid twisting of components as the screws are tightened. THis is probably more due to the fact that these components are drilled on multi-borer so it's no extra time/step to put a dowel drill in one of the drilling heads. Biscuits would work as well if glued in/swollen. Confirmats are commonly used to join chipboard, plywood, but also other wooden elements. They are suitable for rigidly joining wooden elements at right angles. Confirmats are also used by do-it-yourselfers to make various clever constructions on their own. Their use is extremely versatile, so together with a skilful handyman's eye they are suitable for many assembly jobs. RE: Glue, it's a common way to make the temporary fasteners permanent, so there's no problems there. Due to its specific construction, the process of joining two wooden elements using a confirmats looks a bit different than it would otherwise. It will be necessary to use a special drill bit for confirmation joints. Confirmats are a type of assembly screws, which are commonly used to join various elements together. They are most commonly found in desks, cabinets, bookcases and drawers. Their construction guarantees a very durable connection. See all information about sealing elements below.

This type of screw is distinguished from others by a modified cutter shape. This design reduces the likelihood of chipping of the material into which the confirmat is embedded. In practice, therefore, once set, the confirmat will provide a strong connection, which should not loosen even after a long period of time.