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. PLEASE NOTE! When viewing eBay reviews for this product please ignore the bad ones! You will see they were not sold by us but other sellers who advertise a Toolzone product but send a cheap imitation that will most likely be HSS finished in a gold coating! The brand you order from us is the brand you will receive! High quality M35 material, fully ground. 99 piece set. Sizes: 1.5mm 16pc | 2mm 16pc | 2.5mm 15pc | 3mm 10pc | 3.2mm 10pc | 3.