CP is offering you a choice of more than 20 hammers designed for both construction and industrial applications, to best match your particular need: CP 4130 & CP 0016: Four bolt design for increased durability, strength and ease of service. 18-19lbs 8-9Kg, Excellent power-to-weight ratio helps drill holes faster and easier than comparable electric rotary hammers, Built-in oiler provides continuous lubrication, Teasing throttle for precise control, Cushioned piston for smooth operation, long life and in.Hushed Powerin. muffler available to reduce noise.