– Made entirely Cast Steel, Heavy duty, Long Life – Chuck takes drill bits with sizes: 0.8mm-1.8mm, 3/8″ – Double pinion action, with 2 gears for more efficiency – Smooth-finished high-strength wooded handles and cast iron breast rest – Suitable for wood, bamboo, soft and thin iron, copper, aluminum, plastic, PVC, acrylic, fiberglass board, circuit board and so on