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  2. Annular cutter - Wikipedia

    en.wikipedia.org/wiki/Annular_cutter

    An annular cutter (also called a core drill, core cutter, broach cutter, trepanning drill, hole saw, or cup-type cutter) is a form of core drill used to create holes in metal. An annular cutter, named after the annulus shape, cuts only a groove at the periphery of the hole and leaves a solid core or slug at the center. [ 1]

  3. History of the floppy disk - Wikipedia

    en.wikipedia.org/wiki/History_of_the_floppy_disk

    The Quick Disk uses a 2.8-inch magnetic media, break-off write-protection tabs (one for each side), and contains a see-through hole near the center spindle (used to ensure spindle clamping). Nintendo packaged the 2.8-inch magnetic media in a 3-inch×4-inch housing, while others packaged the same media in a 3-inch×3-inch square housing.

  4. Door breaching - Wikipedia

    en.wikipedia.org/wiki/Door_breaching

    [10] [6] [11] Padlocks and similar barriers can also be removed with bolt cutters. [11] [12] Doors can also be breached by cutting through the material of the door itself with a circular saw, though this is much slower. [13] Although not strictly pertaining to door breaching, windows can also be breached to gain entry using a "break and rake" tool.

  5. Mortise lock - Wikipedia

    en.wikipedia.org/wiki/Mortise_lock

    Mortise lock. The two main parts of a mortise lock. Left: the lock body, installed in the thickness of a door. This example has two bolts: a sprung latch at the top, and a locking bolt at the bottom. Right: the box keep, installed in the doorjamb. A mortise lock (also spelled mortice lock in British English) is a lock that requires a pocket ...

  6. Door handle - Wikipedia

    en.wikipedia.org/wiki/Door_handle

    The most common types of door handle are the lever handle and the doorknob. Door handles can be made out of a plethora of materials. Examples include brass, porcelain, cut glass, wood, and bronze. [1] Door handles have been in existence for at least 5000 years, and its design has evolved since, with more advanced mechanism, types, and designs made.

  7. Floppy disk variants - Wikipedia

    en.wikipedia.org/wiki/Floppy_disk_variants

    A Maxell-branded 3-inch Compact Floppy Disk. The floppy disk is a data storage and transfer medium that was ubiquitous from the mid-1970s well into the 2000s. [1] Besides the 3½-inch and 5¼-inch formats used in IBM PC compatible systems, or the 8-inch format that preceded them, many proprietary floppy disk formats were developed, either using a different disk design or special layout and ...

  8. Unusual types of gramophone records - Wikipedia

    en.wikipedia.org/wiki/Unusual_types_of...

    Aretino had a three-inch hole. [20]: 9 The 3-inch spindle format would be resurrected some 40 years later for the Holy Bible Old and New Testaments produced at 16 RPM by the Audio Book Company of St. Joseph, Michigan. The rarest edition comes with a fibreboard insert to adapt the 3-inch hole of the vinylite discs to a standard phonograph hole.

  9. List of screw drives - Wikipedia

    en.wikipedia.org/wiki/List_of_screw_drives

    PZ1 is normally used on screw diameters from 2–3 mm, PZ2 from 3.55 mm and PZ3 from 5.5 mm to 8 mm. These sizes roughly correspond to the Phillips head numbers. Pozidriv screws have a set of radial indentations (tick marks) set at 45° from the main cross recess on the head of the screw, which makes them visually distinct from Phillips screws.

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