AUTOMATIC CENTER PUNCH: Automatic center punch provides automatic, high-impact, spring-loaded striking on the cap; Its brass body has a deep, knurled surface for non-slip control. The aluminum protective case can provide convenient storage and carrying. DUAL CUTTING BLADE AND ALUMINUM BOX:The double cutting blade provides faster and smoother cutting; an aluminum alloy box can protect the drill bit. LONG LIFE AND SERVICE LIFE: alloy steel, impact resistance, extend the life of the center punch. TIME SAVING: Covering assorted pitch sizes allows different holes to be drilled or enlarged in a drill bit without constantly changing bits. The size is laser engraved into the metal, so it can be drilled precisely and will not wear out even if used for a long time. Product size: 15 x 12.5 x 4.3 cm. Product material: 4241 high speed steel Product configuration: 5 inch triangular shank titanium plated step drill bits, 1 gold center punch (see image for details)