Parts List: 7×Drill Bit Highlight description: [Premium Tungsten Steel Material] This 4-edge cross drill bit is made of high quality tungsten steel material, anti-rust dealing and reinforced head. It can prevent drill bit from cracking and have a longer service life [Cross-Angle Design] The precise and unique cross-angle designed ground spear tip reduces drill bit slippage and walking. The advanced tile cutting tool cuts through tiles like butter, very neat and fast [Easy to Use] This masonry drill bit set is easy to get started for professional and novice. It is easier and safer to install in all power tools, suitable for most electric drills, hand drills, lithium drills and more [Widely Uses] This concrete drill bit is suitable for stone, cement, wood, red brick, steel, aluminum, ceramic tile, plastic, marble, thin iron plate, etc. Please try to keep the drill bit vertical and keep the drill bit cool through cooling water; do not use on hard tiles [After-sales] If you have any questions, please get in touch with us, our service team will provide you with a professional and satisfactory service Detailed description: Description: Our 4-edge cross drill bit is made of premium tungsten steel material, which is rustproof and can serve you for a long time. It adopts precise cross-angle design and reduces drill bit slippage and walking. It is quick to change and easy to use. Feature: Quick Change: This cross drill bit is easy and quick to change, and can install on the power tool, like electric drills, hand drills, lithium drills and more. Long Service Life: Our drill bit has long using life and easy to get started, whether you are a professional or a novice. Specification: Product Name: 4-Edge Cross Drill Bit Set Product Material: Tungsten Steel Product Size: 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mm Total length: between 98-126mm Manual measurement may have 1-30mm error Color: As Shown Notes: 1. Please try to keep the drill bit vertical and keep the drill bit cool through cooling water; do not use on hard tiles. 2.There may be slight differences between the picture and the actual color of the commodity. We will try our best to show you the exact color. 3.Please allow slight dimension difference due to manual measurement. [Premium Tungsten Steel Material] This 4-edge cross drill bit is made of high quality tungsten steel material, anti-rust dealing and reinforced head. It can prevent drill bit from cracking and have a longer service life [Cross-Angle Design] The precise and unique cross-angle designed ground spear tip reduces drill bit slippage and walking. The advanced tile cutting tool cuts through tiles like butter, very neat and fast [Easy to Use] This masonry drill bit set is easy to get started for professional and novice. It is easier and safer to install in all power tools, suitable for most electric drills, hand drills, lithium drills and more [Widely Uses] This concrete drill bit is suitable for stone, cement, wood, red brick, steel, aluminum, ceramic tile, plastic, marble, thin iron plate, etc. Please try to keep the drill bit vertical and keep the drill bit cool through cooling water; do not use on hard tiles [After-sales] If you have any questions, please get in touch with us, our service team will provide you with a professional and satisfactory service