API 11B SXL Sucker rod guide for Oilfield 

API 11B SXL Sucker rod nylon guide for Oilfield Product Description Type Centralizer I/D(inch) For Tubing diameter(inch) FZ3/4 3/4 2-3/8"/2-7/8" FZ7/8 7/8 2-3/8"/2-7/8"  FZ1  1  2-7/8"/3-1/2" 2.The major technical indicators Rockwell hardness (HRC):  M85 - M114 Compressive strength:     60 - 90 MPa Impact Strength:          3.5 - 4.8 kJ/m2…