[SPECIFICATIONS]13pcs cobalt hex drill bits set, include 1.5, 2.0, 2.5, 3.0, 3.2, 3.5, 4.0, 4.5, 4.8, 5.0, 5.5, 6.0, 6.5mm with 1/4 hex . [ADVANTAGE] plug hex of quick change drill bit is an upgrade version, it shows performace than normal pressed hex , avoid drills peeling from the hex , effectively keep hex locked with drill bits during impact drilling process.Cobalt-containing drills last than titanium-containing drills. [FULLY GROUND PROCESS & 135degree SPLIT POINT]Fully ground spiral flute discharge scraps quickly, reduce friction and heat, therefore provides a faster, cooler and more efficient drilling performance; 135degree Split Point with straight prevents slippage and makes drilling stable and precise. No center punch is needed. [QUICK CHANGE]1/4inch hex base well fits into majority drill and drill press, more and securely installation without slippage and shedding. [MULTIPLE APPLICATION]Small Drill bits for wood, plastic, steel plate(less than 5mm) , aluminum alloy and other soft metals. perfect for DIY projects, household maintenance and repair, NOT for glass, ceramic or concrete drilling. Colour:silver Material:high speed steel Package Contents: 13 x cobalt hex drill bits Only the above package content, other products are not included. Note: Light 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.