7-piece multipurpose drill bit set — for glass, ceramics, wood and concrete What’s included 7 pieces covering common drilling needs: glass drill bits, hard-alloy hole openers, hard-alloy ceramic drill bits, and a 4-blade spiral drill. Key benefits Versatile: single set provides the range of bits needed for different materials and hole sizes, reducing the need to buy separate bits. Durable construction: bits are made with hard-alloy and ceramic components for improved hardness and wear resistance. Clean, controlled drilling: the 4-blade spiral design and dedicated hole openers are intended to produce precise holes in brittle materials like glass and ceramic as well as in wood and concrete. Features Material: hard-alloy and ceramic drill bit elements for strength and longevity. Design: 4-blade spiral option for effective cutting and stable drilling. Multi-surface use: suitable for ceramics, glass, wood and concrete. How this set solves common problems Avoids multiple purchases by combining glass-specific bits and hard-alloy hole openers in one kit. Provides appropriate bit geometry for brittle surfaces (glass, tile, ceramic) and general-purpose work (wood, concrete). Helps produce controlled, accurate holes when working with fragile materials. Practical use scenarios Installing a bathroom shelf or towel bar: drill clean holes through ceramic tile or porcelain using the glass/ceramic bits and hole openers. Creating openings in glass or mirror panels for fixtures or mounting hardware. General home repairs or DIY projects that require holes in wood, masonry or concrete where a dedicated 4-blade spiral and hard-alloy bits improve cutting performance. Notes for use Match the bit type to the material (glass/ceramic bits for brittle surfaces; hard-alloy/spiral bits for wood and concrete). Use appropriate drilling speed and coolant/water when drilling glass or ceramic to extend bit life and improve hole quality.