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Product specifications:Material: YG8 hard alloyColour:Black7-piece:1/4 (3.94 inch - 4 included),commonly used in home applications.5/16(4.53 inch - 1 included)3/8 (4.72 inch - 1 included)1/2 (4.72 inch - 1 included)Suitable for: masonry wall, cement wall, concrete, tile, wood, metal, stainless steel, aluminum alloy, wood, bubble brick, etc.Water is recommended for drilling on: stainless steel, glass, ceramic tile, marble, granite etc. (The drilling head can resist high temperature up to 1000 ℃. However, long session of work over 1000 ℃ may cause the head to burn.)Lithium drill lower than 24V is not recommended.Please change position when there is reinforced concrete ahead; drilling on it will damage the drilling edge