Specification - 10Pcs 4mm cobalt drill bits, each kit contains a total of ten drill bits in the same size, Blade length: 43mm/1.7inch, 118 degree point, straight shank.
Material - HSS Cobalt high speed steel for super abrasive resistance in tough metals, improve much higher heat resistance because of cobalt steel's high red hardness.
Durable - HSS Cobalt Drill Bit provide strong durable performance compared to typical hss drill bits.
Easy to Carry - The twist drill bits are housed in plastic case for easy storage, easy to carry out homework.
Multi-purpose Use - HSS Drill Bits are successful in cutting hard metals such as stainless steel, copper, aluminum alloy, and also can be used for softer materials.