drilling equipment 1.gasoline engine 2.man-made PCD drilling bit Concrete core drilling equipment(EN 1254-1)Concrete Hollow Boring Machine, drilling machine, testing ... materials, like fire-proof material , ceramics,glasses and rock2. Characteristic:1)Use imported gasoline engine, drive conveniently, run reliably, operate simply2 ... : 5.5HP, speed: 3600r/min) Concrete core drilling equipment(EN 1254-1)