1) One drill bit replaces two drill bits, perfect for drilling fastner holes in bathroom tiles, or wall mirrors. Once it drills through the tile or mirror this drill bit will cope easily with any masonry behind it2) Spear pointed design strong tungsten carbide tip can easyly penetrate various material(tile, concrete, brick, glass, plastic and wood,etc) and reduces breakout3) 10 Pcs pack of 8mm (5/16 inch) drill bits, perfect for professional users and contractors who can carry these drill bits as their daily work tools for repeatly heavy duty drilling work. Drill bits are stored in a compact plastic square box that is easy to carry and store4) U type slot design with fast drilling dust remove, 3-flats shank allows drill bit to be held tightly and stably in power drill5) When drilling hard material (glass, porcelain floor tile, marble or granite), please use water for lubricationsize:110*8mmMaterial: steelcolour:Silver + blackPackage Contents:10 * 8mm Glass drill bitOnly 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.