Use super-hard high-speed steel, durable To optimize the through the center of the design, based on the machined,workpiece more smooth Has a very high wear resistance and strength, exclusively for high-speed cutting of high,hardness cutter versatile applications Capable of 55 degrees of heat directly following a high speed roughing to fine machining, reducing the number of tool changes ahead of the machine utilization rate, save when making process to the cutting surface milling / short side milling based. Material: High-speed steel Flute quantity: 4 color:Silver Size: 1.5mm: Cutting Diameter:1.5mm; Shank Diameter:6mm;Overall Length:51mm; 2mm: Cutting Diameter:2mm; Shank Diameter:6mm;Overall Length:51mm; 2.5mm: Cutting Diameter:2.5mm, Shank Diameter:6mm;Overall Length:52mm; 3mm: Cutting Diameter:3mm; Shank Diameter:6mm;Overall Length:52mm; 4mm: Cutting Diameter:6mm; Shank Diameter:6mm;Overall Length:55mm; 5mm: Cutting Diameter:5mm; Shank Diameter:6mm;Overall Length:57mm; 6mm: Cutting Diameter:6mm; Shank Diameter:8mm;Overall Length:60mm; Suitable For: Carbon steel, tool steel, alloy steel, tool steel, quenched and tempered steel, cast iron, stainless steel, heat-treated steel Note: Before using this tool, please measurement tool deflection, tool deflection accuracy exceeds 0.01MM, please correct before cutting. The shorter the length of the tool projecting chuck of the better, if the amount of the tool extends the projected long, please cut their own speed, feed rate or cutting the amount. When cutting, if the abnormal vibration or sound, cut spindle speed and depth of cut to improve the situation so far. Cooling the steel material to a spray or jet is the to apply, so that high aluminum titanium play the best results. Stainless steel, titanium alloy or heat resistant alloy recommend the use of non-water-soluble cutting fluid. Package Contents: 7 x 4 Flute End Mill Cutter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.