... ,Retainer: PTFE, Nylon, PEEK Or Stainless Steel9,Bore Size:from 1mm to 15mm10,Outside Diameter:from 3mm to 50mmTYPE ... Size Designation Metric Open Bore Size:from 1mm to 15mm MR,67, ... 68,69series Metric Shielded Bore Size:from 1mm to 15mm MR,67,68,69series Inch Open Bore sizes 0. ... 0781 to 0.375 inches R series Inch Shielded Bore sizes 0.0781 to 0.375 ...