: tungsten carbide masonry drill bits, with reinforced head, high hardness, not easy to break and bend, anti-rust surface treatment, long service life Spear Bit Head: Sharp spear edges provide high drilling speed even in hard materials, are 85% faster than standard bits, U-shaped groove provides good chip removal Triangular Shank: The triangular design of the shank helps the hand electric drill clamp the drill bit and prevent slipping and wandering, suitable for most hand electric drills 7 Size: Masonry drill bit with 7 different sizes: 3mm, 4mm, 5mm, 2 x 6mm, 2 x 8mm, 2 x 10mm, 12mm, different sizes for different uses, perfectly adapt to various drilling tasks and high drilling accuracy Wide Application: Ideal for most materials in interior design work, metal, glass, ceramic tiles, wood, ceramics, stone, concrete, bricks, etc. (When drilling hard materials, please use water for lubrication) Product Description 10Pcs Masonry Drill Bits Tungsten Carbide Drill Bit Set ideal for most materials in interior design work, metal, glass, ceramic tiles, wood, ceramics, stone, concrete, bricks, etc. (when drilling hard material, please use water for lubrication). Feature: - Made of tungsten carbide, with reinforced head, high hardness, not easy to break and bend, surface anti-rust treatment. - Spear sharp edges provide high drilling speed even in hard materials, 85% faster than standard drill bits. - U-type slot design with fast drilling dust collection, triangular handle design, more stable operation. - With 7 different sizes: 3mm, 4mm, 5mm, 2 x 6mm, 2 x 8mm, 2 x 10mm, 12mm, different sizes for different uses. Note: 1. When drilling hard materials (glass, porcelain floor tiles, marble or granite), please use water or oil for lubrication, which helps to extend the life of the bits and can also increase the drilling speed. 2. Do not use the impact mode of drills or hammers when using the multi-material drill bit. 3. N'utilisez pas le mode impact des perceuses ou des marteaux lorsque vous utilisez le foret multi-matriaux. 3. The drilling speed of the multi-material drill bit should be slow, especially at the beginning of drilling. Specification: Material: tungsten carbide tip Shank: 3-flat shank Size: 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mm Package Included: 1x 3mm Masonry Drill Bit 1x 4mm Masonry Drill Bit 1x 5mm Masonry Drill Bit 2 x 6mm Masonry Drill Bit 2 x 8mm Masonry Drill Bit 2x 10mm Masonry Drill Bit 1x 12mm Masonry Drill Bit 12mm Product color: black and silver Product size: 3-12mm Quantity delivered: 10 piecesYeuri