FAST AND ACCURATE DRILLING - The Design of SDS Plus Bit Slot Allows Maximum Removal of Concrete, Making It Easy to Use and Efficient In Drilling --Cross Head Surface of Copper, Self-Centering Knife Tip, High-Speed Drilling, Chip Evacuation Quickly; Four-Slot Design, Quick Chip Evacuation, Reduce Wear. TWO TYPES OF GROOVES--The Smaller Grooves Fix Bit In The Chuck. The Larger Grooves Allow Bits Slipping In The Chuck When Working, Enhancing The Drilling Torque and Hammering Energy. WIDE APPLICATION--Used for Drilling Adhesive, Concrete, Brick Wall and Other Stone Materials, Widely Used In Construction, Installation and Other Industries, It Is A Highly Efficient Professional Drill. Surface treatment: sandblasting Knife head: cross copper plating Mode of action: deep drilling Shank type: 2-pit, 2-slot round handle Shank Type: SDS-Plus Colour:Silver Material:45#Steel YG8C cutter head Size:5mm, 6mm, 8mm, 10mm, 12mm, 16mm, 18mm Length: 160MM Package Contents: 7 x SDS-PLUS Drill Bits Only the above package content, other products are not included. Note: Light shooting 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.