Wire-wound glass is a kind of Safety Glass produced by calendering process. The rolled wire mesh is unwound from the wire feeding device and sent to the molten glass liquid, and is passed through the upper and lower calender rolls together with the glass liquid to form a wired glass. The shape of the wire mesh in the wired glass is generally square or hexagonal, and the surface of the glass may be patterned or glossy. The thickness of the wired glass is generally 6-16mm (excluding the thickness of the intermediate wire), and the safety glass can be used in the roof of the building.
Forstner bits, flat-bottomed to drill holes in wood materials, they can cut on the edge of a block of wood, and can cut overlapping holes; for such applications they are normally used in drill presses or lathes rather than in hand-held electric drills. Because of the flat bottom of the hole, they are useful for drilling through veneer already glued to add an inlay.
The bit includes a center point which guides it throughout the cut (and incidentally spoils the otherwise flat bottom of the hole). The cylindrical cutter around the perimeter shears the wood fibers at the edge of the bore, and also helps guide the bit into the material more precisely.
Forstner bits have radial cutting edges to plane off the material at the bottom of the hole. The bits shown in the images have two radial edges; other designs may have more. Forstner bits have no mechanism to clear chips from the hole, and therefore must be pulled out periodically.
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