Looking for harder wearing Drill Bits than hss and titanium? Then these Cobalt Bits are for you. Cobalt is well known for its resistance to heat and this is key to its hard wearing properties. Unlike other Cobalt Bits sold on eBay these are Solid 5% Cobalt and can be re-sharpened again and again. So if you are working with hard tough metals then look no further. High quality M35 material, fully ground. 99 piece set. Sizes: 1.5mm 16pc | 2mm 16pc | 2.5mm 15pc | 3mm 10pc | 3.2mm 10pc | 3.5mm 8pc | 4mm 8pc | 4.5mm 3pc | 5mm 3pc | 5.5mm 2pc | 6mm 2pc | 6.5mm 2pc | 8mm 2pc | 10mm 2pc. Supplied in heavy duty metal case. 135 degree split point. Brand: BlueSpot (Comes with Blue Spot Lifetime Guarantee after online registration). .