Comparison : Item # TEC-M3, TEC Series® 0.134 Inch (in) Inner Diameter (A) SCM435 or 4130 Alloy Steel Washer
Item # TEC-M3.5, TEC Series® 0.154 Inch (in) Inner Diameter (A) SCM435 or 4130 Alloy Steel Washer
Item # TEC-M4, TEC Series® 0.173 Inch (in) Inner Diameter (A) SCM435 or 4130 Alloy Steel Washer
Item # TEC-M5, TEC Series® 0.213 Inch (in) Inner Diameter (A) SCM435 or 4130 Alloy Steel Washer
Item # TEC-M6, TEC Series® 0.256 Inch (in) Inner Diameter (A) SCM435 or 4130 Alloy Steel Washer