1) Inner diameter ranging from 6mm to 80mm;
2) Metric series and imperial series are both available;
3) Part numbers: from POS5 to POS30, PHS5 to PHS30, 

POSB3 to POSB16, PHSB3 to PHSB16, GIR--UK series, 

GAR--UK series, SI--BK series, SA--BK series, etc.