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  2. Climbing hold - Wikipedia

    en.wikipedia.org/wiki/Climbing_hold

    Natural stone climbing holds. In the early stages, climbing holds were crafted by casting real rocks into concrete blocks; later, they evolved into rocks with holes drilled into them, allowing attachment to a wall. While the feel of these holds is realistic, rock holds are heavy and can polish with heavy use.

  3. Lewis (lifting appliance) - Wikipedia

    en.wikipedia.org/wiki/Lewis_(lifting_appliance)

    To bed a stone using a lewis, the stone is placed on dunnage laid flat with enough clearance for a mortar bed to be placed beneath it. The safety straps are removed, the stone is lifted using the lewis alone, and the dunnage removed with fingers clear. The stone is then lowered onto the mortar bed, and positioned with sharp taps from a rubber ...

  4. Dead-blow hammer - Wikipedia

    en.wikipedia.org/wiki/Dead-blow_hammer

    Solid-head dead-blow hammers are usually made of rubber or resilient plastic (such as polyurethane or ultra high molecular weight polyethylene UHMW) and rely on the inherent properties of the material to absorb shock and reduce rebound. Composite heads and fiberglass handle models are also available, with optional shock-absorbent rubber grips ...

  5. Abrasive - Wikipedia

    en.wikipedia.org/wiki/Abrasive

    Abrasives generally rely upon a difference in hardness between the abrasive and the material being worked upon, the abrasive being the harder of the two substances. However, it is not strictly necessary, as any two solid materials that repeatedly rub against each other will tend to wear each other away; examples include, softer shoe soles wearing away wooden or stone steps over decades or ...

  6. Quern-stone - Wikipedia

    en.wikipedia.org/wiki/Quern-stone

    Quern-stones are stone tools for hand-grinding a wide variety of materials, especially for various types of grains. They are used in pairs. The lower stationary stone of early examples is called a saddle quern, while the upper mobile stone is called a muller, rubber, or handstone. The upper stone was moved in a back-and-forth motion across the ...

  7. Chuck (engineering) - Wikipedia

    en.wikipedia.org/wiki/Chuck_(engineering)

    This is the most common size and takes a hammer up to 4 kg. The wedges grip an area of 75 mm 2 (0.116 sq in) and the shank is inserted 40 mm into the chuck. SDS-top A 14 mm shank similar to SDS-plus, designed for hammers from 2 to 5 kg. The grip area is increased to 212 mm 2 (0.329 sq in) and the shank is inserted 70 mm. This size remained ...

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  9. Bitumen - Wikipedia

    en.wikipedia.org/wiki/Bitumen

    A re-examination of artifacts uncovered in 1908 at Le Moustier rock shelters in France has identified Mousterian stone tools that were attached to grips made of ochre and bitumen. [31] The grips were formulated with 55% ground goethite ochre and 45% cooked liquid bitumen to create a moldable putty that hardened into handles.

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