Diamond ring drill (diamond crown) are used in drilling for natural and construction materials (granite, marble, concrete, reinforced concrete, brick, ceramics, glass).
Housing drills can be used several times by solder segments. Drill consists of a case and set out on his diamond segments. Come crowns d.25 mm – 600 mm, and length of the hull – 400-450 mm (mount ½”, 1 1/4" UNC).
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