Sworker 8 PCS Tungsten Carbide Burr Set. Designed in Germany, Manufactured by Germany and USA-made 6-Axis CNC, Made in China. Package Includes: 8 PCS 1/4" shank carbide burr set, 1 eight-slots inner plastic clamshell box, 1 outer plastic buckle hook clamshell box and 1 manual. Head Shapes: Ball, Cylinder, Ball-Nosed-Cylinder, Ball-Nosed-Cone, Ball-Nosed-Tree, Flame, Oval. Head Dia.: 6,8,10mm. Head L.: 7,16,18,20 mm. Head Spiral Flutes Qty.: 15,18,20. Head Material: Tungsten Carbide. Head Hardness: HRA90. Shank Dia.: 1/4”(6.35mm). Shank L.: 45mm. Shank Material: 40Cr. Overall L.: 52 to 65 mm. Cut Style: Double Cut, Max Rotation Speed: 60000 RPM, Direction of Rotation: Right Hand/Clockwise, Feed Direction: Generally counter-rotationally or with a swinging motion. direction of rotation to get fine finish. Optimal Drive Tool: Straight, Angle Die Grinder, Robot. Average Drive Tool: Drill, Drill Press. Drive Type: Air or Electric Rotary Tool. Optimal Fix Type: 1/4”(6.35mm) Collect and Nut, Average Fix Type: 3-jaws Chuck. Materials Applications: Hard Wood, Balsa, Wax, Soapstone, Slate, Marble, Granite, Concrete, Steel, Hardened Steel, Weld-Seam, Stainless Steel, Brass, Copper, Bronze, Aluminum, Cast-Iron, Cast-Steel, Cobalt, Nickel, Titanium, Zinc, Earthenware, Terracotta, Porcelain, Fiberglass, Plastic, Rubber, Fiber-Reinforced Plastics and so on. Burrs Applications: Carving, Engraving, Sculpting, Deburring, Contouring, Chamfering, Milling, Cleaning, Porting, Cutting, Grinding, Polishing, Elongating, Tooling, etc. Manual: 1, Always wear ear, eye, face protection and protective safety gloves. 2, Generally, for rough work, move the burrs across the workpiece counter-rotationally. 3, Pass the tool over the workpiece in the direction of rotation to achieve fine finishes. 4, Min Clamping depth is 2/3 of the shank, if you have to clamp less, pls low speed. 5, If rough running, strong vibrations and increased flying sparks, pls use a new one. 6, Do not apply too much pressure, Let the speed do the work. Smaller burrs require faster speeds. 7, Soft materials, such as aluminum, use a grinding oil to reduce debris clogging. Grind glass, use water as lubricant. 8, Elongate holes, grip tool firmly with two hands and use a swinging motion, which prevents chatter, result in a safer cut. 9, Avoid impact loads, otherwise parts teeth will break off, shank will bend. Do not sink the burr for more than 1/3 of its periphery. 10, Recommendation for drives: shank 1/8" (75 to 300W), shank 1/4" (from 300W), for coarse cuts, 500W+ advantageous.