[SPECIFICATIONS]13pcs cobalt hex shank 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 shank. [ADVANTAGE]Special plug hex shank of quick change drill bit is an upgrade version, it shows excellent performace than normal pressed hex shank, avoid drills peeling from the hex shank, effectively keep hex shank locked with drill bits during impact drilling process.Cobalt-containing drills last longer 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 shank prevents slippage and makes drilling stable and precise. No center punch is needed. [QUICK CHANGE]1/4inch hex shank base well fits into majority drill and drill , more easily and securely installation without slippage and shedding. [MULTIPLE APPLICATION]Small Drill bits for wood, plastic, steel plate(less than equal 5mm) , aluminum alloy and other soft metals. choice 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 shank 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.