" About this item Size: 7 different sizes: 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mm Material: Made of upgraded thick tungsten carbide, anti-rust treatment, long service life. Usage: Easy to control, easy to use, safe and reliable, improve the working environment. Design: U-shaped groove for fast drilling and dust removal, triangular handle, more stable operation. Usage: Suitable for precision drilling of hard and fragile materials such as glass, ceramic tiles, ceramics, wood, marble, brick walls, etc. Material: Ceramic Size: 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12 mm Color: Black Package includes: 7 x multi-material drill bits U-shaped design, fast drilling and dust removal, triangular handle, more stable operation. Suitable for precision drilling on hard and fragile materials such as glass, tiles, ceramics, wood, marble and brick walls. Easy to control, easy to use, safe and reliable, and improve the working environment. Different materials can achieve high quality, durability and precision.