Detail 51 pcs. Hss Engineering Drill Bit Set 1 - 6mm in 0.1mm incrementsThis is the best grade of HSS steel. The truth of quality engineering. This drill bit set has been fully precision ground and heat treated for added strength and durability. Fully grounded bits are machined from a single rod and are much better than a regular rolled or twisted drill bit. They are also much more expensive to produce. They have long-lasting working ability and use an aggressive design split by 135 degrees. This set also comes with a handy bespoke l carrying case, so you can keep them organized into their correct and organized positions. Starting from 1mm, these drill bits increase in size in 0.1mm increments Hss 135 degree split point Color: Silver Honed High Speed Steel (HSS) General use for wood, metal and plasticSizes from 1mm to 6mm in 0.1mm incrementsPackage Included: 51 x Drill Bit Set1 x Box (Random Color, Color Cannot Be Selected) Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement error is +/- 1-3cm.