I Use HCD70, HCD80, HCD90, HCR80vibratory tamper is the adult punner. construction ministry of has promulgated the profession standard JG/-r5014.1 4 in 1992. Characteristics of it are slight volume, light weight, well welt capability, turnaround in-situ, agile operation and high ramming efficiency. This tamper is suitable for the pureness earth, the crushed stone, the concrete cement and each kind of grittiness soil, and also for the asphaltic sands, the oil coated stone, the concrete and the clay. It is widely used in the road, the railroad, and the municipal administration construction, for the ramming of the roadbed, the side slope, pipeline paved, backfill earth, as well as foundation construction work such as path, bridge, reservoir, house and so on. It is suitable especially for the construction of the ground in room, the garden, the lower part of wall and each kind of trench and other narrow location. (HCR80 is suitable for the work without power.) It is also competent in the work which other large-sized and medium-sized tampers are unable to complete.