HIGH-QUALITY MATERIALS:Made of Premium carbide YG6X alloy with anti-rust treatment and a reinforced head prevents bit cracking and provides a life. AND PRECISE: unique angle design ground spear tip reduces bit skating and walking; superior tile cutter run through ceramic tile like butter, extremely neat and fast. HEX FOR QUICK CHANGE: 1/4inch Hex fits into all more easily and securely; and other hand drill, bench drill with locking into quick change chuck. WIDELY APPLICATION: It is suitable for Glass, Ceramic, Tile, Mirror, Plant Pots, Wood, Porcelain, Brick Wall, marble, thin iron plate etc. Please try to keep the drill vertical and keep bits cool with a of cooling water; 'T on hard tile. Colour:Black Material:Cemented carbide Package Contents: 2* Drill Bits 5mm 4* Drill Bits 6mm 2* Drill Bits 8mm 1* Drill Bits 10mm 1* Drill Bits 12mm Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.