For PRD hammer,drilling range is from 800 mm to 1500 mm,because of its large external Diameter,its noise and vibration are higher.In this case,can use the cluster hammer to decrease the noise and vibration.

(Although its external diameter are large,but some small hammers are formed in the cluster hammer.)

Model	Hammer Out Diameter (mm)	Combined Bit(EA)	Hammer Length (mm)	Hammer Weight(Kg)	Air Consumption
					150PSI  (10.5kg/ ㎠ )	250PSI  (17.6kg/ ㎠ )
CLUSTER 381	381	5	1,950	970	1,200 CFM (34 ㎥ /min)	1,680 CFM (47.5 ㎥ /min)
CLUSTER 445	445	5	1,950	1,350	1,270 CFM (36 ㎥ /min)	1,750 CFM (49.5 ㎥ /min)
CLUSTER 610	610	5	2,300	3,480	1,425 CFM (40 ㎥ /min)	1,950 CFM (55 ㎥ /min)
CLUSTER 800	775	5	2,595	5,700	3,850 CFM (109 ㎥ /min)	4,565 CFM (129 ㎥ /min)
CLUSTER 1000	915	5	2,595	6,100	3,965 CFM (112 ㎥ /min)	5,200 CFM (147 ㎥ /min)
CLUSTER 1500	1380	7	2,700	9,600	4,750 CFM (134 ㎥ /min)	6,240 CFM (176 ㎥ /min)
CLUSTER 2000	1910	6	3,190	20,000	7,000 CFM (198 ㎥ /min)	8,500 CFM (240 ㎥ /min)
CLUSTER 2500	2490	7	3,500	25,000	8,400 CFM (237 ㎥ /min)	10,000 CFM (283 ㎥ /min)