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The Best Masonry Drill Bit Sets. Best Overall: BOSCH Impact Tough ... these German-made bits are specifically designed to continue drilling when they come in contact with rebar, and won’t lock ...
Masonry bits typically are used with a hammer drill, which hammers the bit into the material being drilled as it rotates; the hammering breaks up the masonry at the drill bit tip, and the rotating flutes carry away the dust. Rotating the bit also brings the cutting edges onto a fresh portion of the hole bottom with every hammer blow.
Bosch entered India in 1922, when Illies & Company set up a sales office in Calcutta. For three decades, the company operated in the Indian market only through imports. In 1951, the Motor Industries Company Ltd. (MICO) was founded, with Bosch instantly buying 49% of its stock.
Fractional drill bit set by Craftsman. Fractional-inch drill bit sizes are still in common use in the United States and in any factory (around the globe) that makes inch-sized products for the U.S. market. ANSI B94.11M-1979 sets size standards for jobber-length straight-shank twist drill bits from 1/64 inch through 1 inch in 1/64 inch increments.
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German company Bosch produced the first "Bosch-Hammer" around 1932 in mass production. The US company Milwaukee Electric Tool Corporation states that in 1935, it was selling a lightweight 1 ⁄ 4 in (6.4 mm) electric hammer drill (cam-action). [15] Hand-cranked percussion drills were made in the UK in the mid-twentieth century. [16]
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