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Top Quality M35 HSS . Top Quality Titanium plated Drill accurate center holes in material prior to turning, or use as a starter bit for accurate holes in stock. Sizes 1, 2, 3, 4 and 5, 60° tip angles. NAIYONG TOOLS top quality M35 HSS center drill set , Top quality Tatinum plated . Specification : 1 set of 5 pieces center drill size in # 1 # 2 # 3 # 4 # 5 this center drill set bit is using vacuum titanium plated which will totally strong the drill set and improve the tools' ability against hard working . M35 HSS is one kind of top quality hss which is contained with 5 % cobalt . HRC is 66 degree around . This material of center drill can made sure you using it against the material which HRC is up to 45 degree . It will made your work easier when you facing the hard material and more effeicient . accuracy : this center drill set is 1 pack of 5 pieces of drills and all size is measure in metric . Small package which is more convenient you to store it when you are working at the working place .