Gunpla bits are made of high quality alloy steel and have well-built heavy-duty tungsten carbide tips. Our fashioned carbide-tipped drill bits are most commonly used for non-tempered glass, ceramics and tiles. They feature a tiny spade-shaped tip made of super-hard tungsten carbide, which is extremely durable and can withstand the friction of drilling into glass. Drill bits are cutting tools used to remove material to create holes, almost always of circular cross-section.