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Turning boring and facing holder, 1)it is main parts of normal lathe, 2)change cutter quickly, 3)high accuracy for fix-postion - details see: https://www.machineto.com/turning-boring-and-facing-holder-10156840

Turning boring and facing holder
1)it is main parts of normal lathe
2)change cutter quickly
3)high accuracy for fix-postion

order no.	A(in)	B(in)	C(in)	D(in)	Tool bit range(in)	Wt(kg)
250-102	1	1/2	29/64	1-1/2	3/16-1/2	0.40
250-202	1-1/8	5/8	1/2	1-3/4	1/4-5/8	0.70
250-302	1-7/16	3/4	5/8	2-1/8	1/2-3/4	1.11
250-402	4-23/32	1	3/4	2-1/2	1/2-1	1.75

v groove hold round shank boring bars and tools as square tool bits to machine end face,external,cutting,boring etc.