4 JAW CHUCK DIA- 250MM W BY O BACK PLATE, 4 JAW CHUCK DIA- 630MM W BY O BACK PLATE, 3 JAW SELF CENTERING CHUCK DIA 250 MM, 3 JAW SELF CENTERING CHUCK DIA 630 MM, 3 JAW POWER OPERATED HOLLOW HIGH SPEED CHUCK OF SIZE- 315MM DIA, 3 JAW POWER OPERATED HOLLOW HIGH SPEED CENTRIFUGALLY COMPENSATED CHUCK OF SIZE- 500 MM DIA