This Makita HSS TiN Metal Drill Bit Set is ideal for professional use as the drill bits have a titanium-nitride coating, this means that they produce minimal levels of friction and therefore reduces friction deposits, keeping the work area clean and tidy and not causing any damage or staining.The HSS construction ensures these drill bits are suitable for alloyed and non-alloyed steel.Included in this set is all in a organised carry case to help keep them organised.Features and Benefits:Sets of drills for metal Makita HSS-Tin Economy are made of high-speed steel HSS by rolling, followed by grinding and coating with titanium nitride.Designed for drilling holes in structural steel (normal and hardened), gray and forged cast iron, various types of plasticTitanium nitride coating increases wear resistance and drill lifeReduced friction coefficient during drillingIncreased drilling speed135 Split Point sharpening does not require center punchingSmall band widthReinforced working part of the drillSupplied in a convenient plastic case.The Makita D-72855 is an Economy 13 Piece HSS-TiN Drill Bit Set with Straight Shanks in sizes: 1.5 2 2.5 3 3.2 3.5 4 4.5 4.8 5 5.5 6 & 6.5mm suited to drilling metal. The Set is made from High Speed Steel with a titanium-nitride coating this means that they produce minimal levels of friction and therefore reduce friction deposits. TiN-coated drill bits should last longer than uncoated bits, and you can often push them faster too. The high surface quality of this ground twist drill bit allows extended usage. It is suitable for use on alloyed and non-alloyed steel, malleable cast iron, sintered iron, new silver, copper, bronze and hard plastics such as perspex.The Makita D-72855 is a 13 Piece Drill Bit Set suited to drilling in Metal, all with straight shanks. HSS-TiN is High Speed Steel with a titanium-nitride coating, this means that they produce minimal levels of friction and therefore reduces friction deposits. TiN-coated drill bits should last longer than uncoated bits, and you can often push them faster too. The high surface quality of this ground twist drill bit allows extended usage. It is suitable for use on alloyed and non-alloyed steel, malleable cast iron, sintered iron, new silver, copper, bronze and hard plastics such as perspex. Features & Benefits • Suited to drilling in Metal • HSS TiN for longer life and less friction • Plastic storage case • Suitable on a variety of applications Specifications • Sizes: 1.5, 2, 2.5, 3, 3.2, 3.5, 4, 4.5, 4.8, 5, 5.5, 6 and 6.5mm • Shank: Straight Contents • 1.5mm HSS TiN Metal Drill Bit • 2mm HSS TiN Metal Drill Bit • 2.5mm HSS TiN Metal Drill Bit • 3mm HSS TiN Metal Drill Bit • 3.2mm HSS TiN Metal Drill Bit • 3.5mm HSS TiN Metal Drill Bit • 4mm HSS TiN Metal Drill Bit • 4.5mm HSS TiN Metal Drill Bit • 4.8mm HSS TiN Metal Drill Bit • 5mm HSS TiN Metal Drill Bit • 5.5mm HSS TiN Metal Drill Bit • 6mm HSS TiN Metal Drill Bit • 6.5mm HSS TiN Metal Drill Bit • Plastic Storage Case