Q&A -Q: What materials can be drilled? A: Concrete, granite, plastic, cement, wood, ceramic, soft metal, hard metal, brick, flower pot, marble, bulletproof board, glass, mirror, window, stainless steel, glass bottle, etc. -Q: Which drill can be adaptable? A: For normal use it is recommended to use the 24V hand drill with the best speed of 600 to 2300 rpm. It is not recommended to use the 12V hand drill for tapping hard materials such as granite, steel, etc.; the 12V hand drill can be used for tapping soft materials such as wood and red bricks. Masonry Drill Bit Set Diamond Hole Saw Set 12Pcs Diamond Hole Saw Set 8Pcs Universal Socket Add to Cart Add to Cart Add to Cart Buying Options Customer Reviews 4.3 out of 5 stars 66 4.4 out of 5 stars 111 4.4 out of 5 stars 111 5.0 out of 5 stars 1 Price $9.99$9.99 $16.59$16.59 $16.59$16.59 — no data Suitable for Concrete, Glass, Ceramics, Wood etc Glass, Ceramics, Tiles, Porcelain Glass, Ceramics, Tiles, Porcelain Screws, Nuts, Bolts etc Size 5/6/8/10/12mm(1/5 in, 1/4 in, 5/16 in, 3/8 in, 1/2 in) 1/4 in (6mm), 5/16 in (8mm), 3/8 in (10mm), 1/2 in (12mm), 9/16 in (14mm), 5/8 in (16mm), 11/16 in (18mm), 3/4 in (20mm), 7/8 in(22mm), 1 in (25mm), 1-1/8 in (30mm), 1-3/8 in (35mm) 1/4 in (6mm), 5/16 in (8mm), 3/8 in (10mm), 1/2 in (12mm), 7/8 in(22mm), 1 in (25mm), 1-1/2 in (40mm), 2 in (50mm) 1/4 to 3/4 inch(7mm to 19mm)