3-13mm Titanium Coated Stepped Power Tools Carbide Mini Drill Bit Introduction: Step drill,also known as multi-purpose drill with straight flute, , slot. White diamonds,titanium drill, colorful diamond,.Handle a round handle, triangular handle,hex shank,SDS shank. It has the functions of deburring, chamfering and elliptic hole enlargement. Don't need to use center punch, it is more and compared with drill. Specification: Material: High Speed Stee( Used for the hardness of the which is below 25°, like iron borad, steel board, PVC board, Insulation board, etc.) Surface: Titanium Plated Type: Straight Flute Handle: Hexagon Shank Scop: thin iron,aluminum,insulation panels,PVC panels 4mm thickness within the timber. Size: 3-13MM 3,4,5,6,7,8,9,10,11,12,13mm 11 steps Features: High speed steel, more. Titanium coated to reduce friction and run cooler No need for a hole, can automatically deburr holes as you drill. Special step stucture, can drill different size holes Working with water, can effectively extend the service life of bit,drilling speed 250--400 recommended. Widely used to cut holes in a variety of like steel, wood, thin iron, aluminum alloy,insulation boards, PVC sheet,ect. Package included: 1x 3-13MM Step Drill bit High speed steel, more. Titanium coated to reduce friction and run cooler No need for a hole, can automatically deburr holes as you drill. Special step stucture, can drill different size holes Working with water, can effectively extend the service life of bit,drilling speed 250--400 recommended.